{"title":"Koyo","description":"\u003cp\u003eMaximize your engine's potential and prevent overheating with the full line of Koyo performance aluminum radiatorsand cooling components, proudly offered in Canada by Straight Six Imports. As an authorized Canadian dealer, we stock the genuine Koyorad products you need for your JDM, import, and performance vehicle, ensuring maximum cooling efficiency for the street, track, or drift course.\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"citation-38\"\u003eKoyorad is the global leader in high-performance cooling, trusted by racers and tuners for their superior design, quality materials, and precision \u003c\/span\u003e\u003cspan class=\"citation-38\"\u003eOEM-fitment\u003c\/span\u003e\u003cspan class=\"citation-38 citation-end-38\"\u003e.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c\/sup\u003e\u003c\/span\u003e Shop our extensive inventory of Koyo radiators including the robust R-Core (53mm), the versatile Hyper V-Core (36mm), and the popular HH-Series. Each radiator is Nocolok-brazed and TIG-welded for unmatched durability and heat dissipation.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"UTF-8\"\u003eUpgrade your cooling system with a Koyo aluminum radiator for your Subaru WRX\/STI, Toyota GR86\/BRZ\/FR-S, Honda Civic\/S2000, Nissan 350Z\/370Z, Mitsubishi Evo, and more. We also carry Koyo oil coolers, filler necks, radiator caps, and intercooler cores. \u003cspan class=\"citation-37\"\u003eGet a \u003c\/span\u003e\u003cspan class=\"citation-37\"\u003edirect bolt-in replacement\u003c\/span\u003e\u003cspan class=\"citation-37 citation-end-37\"\u003e that eliminates fitment headaches and provides optimal temperature control for your modified or high-power engine.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"citation-37 citation-end-37\"\u003e\u003cmeta charset=\"UTF-8\"\u003eProtect your investment with genuine Koyo technology. Shop Canada's top source for Koyorad parts—Straight Six Imports.\u003c\/span\u003e\u003c\/p\u003e","products":[{"product_id":"koyo-universal-aluminum-hypercore-intercooler-core-23in-x-11in-x-4in","title":"Koyo Universal Aluminum HyperCore Intercooler Core (23in. X 11in. X 4in.)","description":"\u003cp\u003eKoyo Universal Aluminum HyperCore Intercooler Core (23in. X 11in. X 4in.)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850165670055,"sku":"KOYCCR2311","price":542.88,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/4917aff609b8f3f4058aade445b6261c.jpg?v=1750351468"},{"product_id":"koyo-universal-aluminum-hypercore-intercooler-core-22in-x-14in-x-2-5in","title":"Koyo Universal Aluminum HyperCore Intercooler Core (22in. X 14in. X 2.5in.)","description":"\u003cp\u003eKoyo Universal Aluminum HyperCore Intercooler Core (22in. X 14in. X 2.5in.)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850165801127,"sku":"KOYCCS2214","price":437.46,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/4917aff609b8f3f4058aade445b6261c_9b018a21-f5f3-46af-9e2a-873a891a2d74.jpg?v=1750351469"},{"product_id":"koyo-universal-aluminum-hypercore-intercooler-core-24in-x-10in-x-2-5in","title":"Koyo Universal Aluminum HyperCore Intercooler Core (24in. X 10in. X 2.5in.)","description":"\u003cp\u003eKoyo Universal Aluminum HyperCore Intercooler Core (24in. X 10in. X 2.5in.)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850165833895,"sku":"KOYCCS2410","price":474.8,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/0b7fdbc21ec46da68d2c81599bde5235.jpg?v=1750351470"},{"product_id":"koyo-06-11-honda-civic-aluminum-filler-neck","title":"Koyo 06-11 Honda Civic Aluminum Filler Neck","description":"\u003cp\u003eKoyo 06-11 Honda Civic Aluminum Filler Neck\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850165899431,"sku":"KOYFN2313","price":102.5,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/4a288d707f4c28a54398da9a664af54f.jpg?v=1750351471"},{"product_id":"koyo-2022-toyota-gr86-subaru-brz-aluminum-filler-neck","title":"Koyo 2022 Toyota GR86\/ Subaru BRZ Aluminum Filler Neck","description":"\u003cp\u003eKoyo 2022 Toyota GR86\/ Subaru BRZ Aluminum Filler Neck\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850165964967,"sku":"KOYFN3037","price":103.51,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/7c7d4fb01df1c577b9c11de152fffb95.jpg?v=1750351471"},{"product_id":"koyo-08-15-subaru-wrx-sti-8mm-coolant-reservoir-adapter-for-part-vh091662","title":"Koyo 08-15 Subaru WRX\/STI 8mm Coolant Reservoir Adapter (For Part# VH091662)","description":"\u003cp\u003eKoyo 08-15 Subaru WRX\/STI 8mm Coolant Reservoir Adapter (For Part# VH091662)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166096039,"sku":"KOYPI-2182","price":22.52,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/0a521fe07adb60acbb0cd531b2f5a75f.jpg?v=1750351473"},{"product_id":"koyo-08-15-subaru-wrx-sti-05-09-legacy-gt-13mm-coolant-reservoir-adapter-for-part-vh091662","title":"Koyo 08-15 Subaru WRX\/STI \/ 05-09 Legacy GT 13mm Coolant Reservoir Adapter (For Part# VH091662)","description":"\u003cp\u003eKoyo 08-15 Subaru WRX\/STI \/ 05-09 Legacy GT 13mm Coolant Reservoir Adapter (For Part# VH091662)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166161575,"sku":"KOYPI-2183","price":22.52,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/0a521fe07adb60acbb0cd531b2f5a75f_bdd7ff2f-3da2-4894-be20-fc3f4f336061.jpg?v=1750351473"},{"product_id":"koyo-06-15-mazda-miata-nc-all-aluminum-reservoir-expansion-tank","title":"Koyo 06-15 Mazda Miata NC All-Aluminum Reservoir Expansion Tank","description":"\u003cp\u003eKoyo 06-15 Mazda Miata NC All-Aluminum Reservoir Expansion Tank\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166227111,"sku":"KOYRT001","price":439.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/00a2eb2df59496900aa35288c25327a2L.jpg?v=1750351474"},{"product_id":"koyo-95-04-toyota-tacoma-v6-4x4-manual-radiator","title":"Koyo 95-04 Toyota Tacoma V6 4x4 Manual Radiator","description":"\u003cp\u003eDirect fit for Manual Transmission equipped 95-04 Tacoma V6 4x4 and Pre Runner V6.  Use Koyorad SK-C13 or equivalent mini style cap, OEM Cap not compatible.; For Automatic Transmission equipped 95-04 Tacoma 4x4 V6 and PreRunner V6:  Requires mandatory ext\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166292647,"sku":"KOYVH010513","price":652.59,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/e03c6d2b3daa117ff213f6456d73ee48.jpg?v=1750351475"},{"product_id":"koyorad-03-09-toyota-4runner-lexus-gx470-4-7l-aluminum-radiator-off-road-use-only","title":"Koyorad 03-09 Toyota 4Runner\/Lexus GX470 4.7l Aluminum Radiator - Off-Road Use Only","description":"\u003cp\u003eKoyorad 03-09 Toyota 4Runner\/Lexus GX470 4.7l Aluminum Radiator - Off-Road Use Only\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166358183,"sku":"KOYVH011703N","price":846.34,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/cc4fb35bdf34b861102b0088fcf7e374.jpg?v=1750351476"},{"product_id":"koyorad-10-20-toyota-4runner-4-0l-v6-5th-gen-aluminum-radiator-off-road-use-only","title":"Koyorad 10-20 Toyota 4Runner 4.0L V6 (5th Gen) Aluminum Radiator - Off-Road Use Only","description":"\u003cp\u003eKoyorad 10-20 Toyota 4Runner 4.0L V6 (5th Gen) Aluminum Radiator - Off-Road Use Only\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166423719,"sku":"KOYVH012493","price":845.33,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/22bb104451413c96879a54f3dcfe1ac5.jpg?v=1750351477"},{"product_id":"koyo-92-00-honda-civic-1-6-dohc-will-not-fit-vehicles-w-ac-manual-transmission-radiator","title":"Koyo 92-00 Honda Civic 1.6 DOHC (Will Not Fit Vehicles w\/AC) Manual Transmission Radiator","description":"\u003cp\u003eManual Transmission, no AC only.  DOHC  w\/ 32mm hoses. Optional mount provided on lower driver?s side of radiator if additional support is desired.\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166587559,"sku":"KOYVH0812N1","price":510.86,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/a41d925cecee3a645dce37942c6a60f1.jpg?v=1750351478"},{"product_id":"koyo-universal-tube-and-fin-crossflow-fluid-cooler","title":"Koyo Universal Tube and Fin Crossflow Fluid Cooler","description":"\u003cp\u003eKoyo Universal Tube and Fin Crossflow Fluid Cooler\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46850166620327,"sku":"KOYXC052304","price":520.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/2cd24de649ac10fbedfbf605d19346ef.jpg?v=1750351478"},{"product_id":"koyo-13-20-scion-fr-s-subaru-brz-2-0l-22-toyota-gr86-subaru-brz-2-4l-mt-at-radiator","title":"Koyo 13-20 Scion FR-S \/  Subaru BRZ 2.0L \/ 22+ Toyota GR86 \/ Subaru BRZ 2.4L (MT\/AT) Radiator","description":"\u003cp\u003eKoyo 13-20 Scion FR-S \/  Subaru BRZ 2.0L \/ 22+ Toyota GR86 \/ Subaru BRZ 2.4L (MT\/AT) Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46879042502823,"sku":"KOYVH012664N","price":561.24,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/79c750a15d3e4c3086c26e3a6b577c47.jpg?v=1751775423"},{"product_id":"koyo-08-15-mitsubishi-evolution-x-aluminum-filler-neck","title":"Koyo 08-15 Mitsubishi Evolution X Aluminum Filler Neck","description":"\u003cp\u003eKoyo 08-15 Mitsubishi Evolution X Aluminum Filler Neck\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006078631,"sku":"KOYFN2316","price":104.41,"currency_code":"CAD","in_stock":true}]},{"product_id":"koyo-13-16-scion-fr-s-subaru-brz-aluminum-filler-neck","title":"Koyo 13-16 Scion FR-S \/ Subaru BRZ Aluminum Filler Neck","description":"\u003cp\u003eKoyo 13-16 Scion FR-S \/ Subaru BRZ Aluminum Filler Neck\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006144167,"sku":"KOYFN2320","price":103.51,"currency_code":"CAD","in_stock":true}]},{"product_id":"koyo-92-96-toyota-chaser-mark-ii-cresta-jzx90-2-5l-turbo-m-t-radiator-jdm-only","title":"Koyo 92-96 Toyota Chaser\/Mark II\/Cresta (JZX90) 2.5L Turbo (M\/T) Radiator (JDM Only)","description":"\u003cp\u003eKoyo 92-96 Toyota Chaser\/Mark II\/Cresta (JZX90) 2.5L Turbo (M\/T) Radiator (JDM Only)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006209703,"sku":"KOYH010409","price":650.45,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/888a9bab109540adcf8a21dedd8a6aeeL.gif?v=1754780980"},{"product_id":"koyo-84-87-toyota-corolla-gt-s-1-6l-4age-ae86-radiator","title":"Koyo 84-87 Toyota Corolla GT-S 1.6L 4AGE AE86 Radiator","description":"\u003cp\u003eKoyo 84-87 Toyota Corolla GT-S 1.6L 4AGE AE86 Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006308007,"sku":"KOYHH010681","price":557.44,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/08c18aaa7133b1aa30e207fd06c440d6L.gif?v=1754780983"},{"product_id":"koyo-96-00-toyota-chaser-jzx100-2-5l-inline-6-turbo-w-manual-trans-radiator","title":"Koyo 96-00 Toyota Chaser JZX100 2.5L Inline 6 Turbo w\/ Manual Trans Radiator","description":"\u003cp\u003eKoyo 96-00 Toyota Chaser JZX100 2.5L Inline 6 Turbo w\/ Manual Trans Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006373543,"sku":"KOYHH010860N","price":638.67,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/d474f9f4a3e6e3b3261df70a8b9486dfL.gif?v=1754780986"},{"product_id":"koyo-08-11-lexus-is-f-5-0l-at-radiator","title":"Koyo 08-11 Lexus IS-F 5.0L (AT) Radiator","description":"\u003cp\u003eRace Use Only - Requires transmission cooler (not included)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006504615,"sku":"KOYHH012170","price":740.29,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/d4c9b8f37f39660005a8323d1a0597c7L_c422d3c7-4ea2-4529-b2a4-1bcba604efdf.gif?v=1754780991"},{"product_id":"koyo-70-74-toyota-celica-1-6-2-0l-i4-mt-radiator","title":"Koyo All-Aluminum Racing Radiator – 1970-1974 Toyota Celica 1.6\/2.0L I4 | Manual Transmission (HH012597)","description":"\u003ch3\u003eKoyo All-Aluminum Racing Radiator – 1970-1974 Toyota Celica 1.6\/2.0L I4 (Manual Transmission)\u003c\/h3\u003e\n\u003cp\u003eKeep your classic Celica’s engine cool under pressure with the Koyo All-Aluminum Racing Radiator — engineered specifically for the 1970–1974 Toyota Celica with 1.6L or 2.0L inline-four engine and manual transmission. Whether you’re building a period-correct restoration, a vintage race car, or a modified street machine, Koyo’s all-aluminum construction delivers dramatically superior cooling capacity over the factory copper-brass radiator — keeping your 2T or 18R engine in its optimal temperature range no matter how hard you push it.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eAll-aluminum construction — superior heat dissipation and significantly lighter than the factory copper-brass radiator\u003c\/li\u003e\n\u003cli\u003eApplication-specific engineering — designed specifically for the 1970–1974 Toyota Celica with manual transmission\u003c\/li\u003e\n\u003cli\u003eHigh-flow core design — increased coolant flow capacity for improved thermal management\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement — uses factory mounting points and hose connections for a clean, bolt-on installation\u003c\/li\u003e\n\u003cli\u003eKoyo racing heritage — engineered by one of Japan’s most respected cooling system manufacturers\u003c\/li\u003e\n\u003cli\u003eCompatible with 1.6L and 2.0L I4 engines — fits both the 2T and 18R engine families\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePerformance Benefits:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Heat Dissipation:\u003c\/strong\u003e Aluminum transfers heat more efficiently than copper-brass, reducing coolant temperatures under sustained hard driving or in hot climates\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight Reduction:\u003c\/strong\u003e All-aluminum construction is significantly lighter than the factory copper-brass radiator — a meaningful weight saving on a lightweight classic platform\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Cooling Capacity:\u003c\/strong\u003e High-flow core design handles the thermal demands of modified engines, forced induction, or track use that overwhelm the factory radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliability:\u003c\/strong\u003e Aluminum construction resists the corrosion and electrolytic degradation that affects aging copper-brass radiators over time\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect-Fit Simplicity:\u003c\/strong\u003e No fabrication or modification required — installs using factory mounting points and hose connections\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Koyo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH012597\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e All-aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission:\u003c\/strong\u003e Manual (MT)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Compatibility:\u003c\/strong\u003e 1.6L I4 (2T) \/ 2.0L I4 (18R)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment Style:\u003c\/strong\u003e Direct replacement (factory mounting points)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment Information:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1970–1974 Toyota Celica\u003c\/strong\u003e — 1.6L I4 (2T engine) and 2.0L I4 (18R engine)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual Transmission only\u003c\/strong\u003e — automatic transmission applications require a different part number\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Verify your specific year, engine, and transmission before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Professional installation recommended; flush and refill cooling system after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat’s Included:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eKoyo all-aluminum racing radiator\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation Notes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eFlush the cooling system completely before installing the new radiator\u003c\/li\u003e\n\u003cli\u003eUse fresh coolant — do not reuse old coolant from the factory radiator\u003c\/li\u003e\n\u003cli\u003eInspect all hoses and clamps and replace if worn or cracked\u003c\/li\u003e\n\u003cli\u003eBleed the cooling system after installation to remove air pockets\u003c\/li\u003e\n\u003cli\u003eCheck for leaks after first heat cycle before returning vehicle to service\u003c\/li\u003e\n\u003cli\u003eUse aluminum-compatible coolant — avoid coolants with silicates that can damage aluminum cores\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eAll-Aluminum vs. Copper-Brass Radiators:\u003c\/h4\u003e\n\u003cp\u003eThe factory Toyota Celica radiator uses a copper-brass construction — the standard for the era, but significantly heavier and less thermally efficient than modern all-aluminum designs. Aluminum transfers heat approximately 50% more efficiently than copper-brass per unit of weight, meaning an aluminum radiator can dissipate more heat with a smaller, lighter core. For a classic Celica that’s been modified, driven hard, or simply has an aging factory radiator, the Koyo all-aluminum unit is a meaningful upgrade in both performance and reliability.\u003c\/p\u003e\n\u003ch4\u003eThe A20\/A40 Celica Platform:\u003c\/h4\u003e\n\u003cp\u003eThe 1970–1974 Toyota Celica (A20\/A40 chassis) is one of the most beloved classic Japanese sports cars — a lightweight, rear-wheel-drive coupe that established Toyota’s performance credentials in the early 1970s. Powered by the 2T or 18R inline-four, the early Celica is a popular platform for vintage racing, restoration, and modified street builds. Cooling system upgrades are particularly important on these classic engines, which were designed for a different era of driving demands and may struggle with modern traffic, hot climates, or performance modifications.\u003c\/p\u003e\n\u003ch4\u003eWhy Koyo?\u003c\/h4\u003e\n\u003cp\u003eKoyo is one of Japan’s most respected cooling system manufacturers, with a heritage in both OEM supply and aftermarket performance radiators. Their racing radiators are engineered using knowledge gained from professional motorsport — including Super GT, Formula Nippon, and endurance racing — and manufactured to exacting quality standards. For classic Japanese platforms like the early Celica, Koyo’s application-specific radiators are among the best-fitting and highest-performing options available in the aftermarket.\u003c\/p\u003e\n\u003ch4\u003ePerfect For:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1970–1974 Toyota Celica owners replacing a worn or leaking factory radiator\u003c\/li\u003e\n\u003cli\u003eClassic Celica builds seeking improved cooling capacity for modified 2T or 18R engines\u003c\/li\u003e\n\u003cli\u003eVintage racing builds requiring reliable thermal management under sustained track use\u003c\/li\u003e\n\u003cli\u003eRestoration builds upgrading to a more reliable, longer-lasting aluminum radiator\u003c\/li\u003e\n\u003cli\u003eAnyone running a modified or turbocharged early Celica that generates more heat than the factory radiator can handle\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Use a quality aluminum-compatible coolant (such as a silicate-free OAT or HOAT formula) to protect the aluminum core and maximize radiator life. Avoid green coolant with silicates in aluminum radiators.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Manual transmission fitment only. Automatic transmission applications require a different Koyo part number. 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Designed specifically for 1989-1994 Nissan 180SX and Silvia S13 with SR20DET engine and manual transmission, this high-performance radiator features 36mm core thickness and dual pass design for superior cooling capacity. Essential for turbocharged builds, track use, and aggressive street driving.\u003c\/p\u003e\u003ch4\u003eKey Features:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDual pass design for improved cooling efficiency\u003c\/li\u003e\n\u003cli\u003e36mm core thickness for increased capacity\u003c\/li\u003e\n\u003cli\u003eDirect fit for S13 SR20DET manual transmission\u003c\/li\u003e\n\u003cli\u003eAll-aluminum construction for weight savings\u003c\/li\u003e\n\u003cli\u003eImproved cooling over factory radiator\u003c\/li\u003e\n\u003cli\u003eTrack-proven performance\u003c\/li\u003e\n\u003cli\u003ePremium Koyo quality and engineering\u003c\/li\u003e\n\u003cli\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003ePerformance Benefits:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Pass Design:\u003c\/strong\u003e Coolant flows through core twice for maximum heat dissipation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e36mm Core:\u003c\/strong\u003e Thicker core provides increased cooling capacity\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuperior Cooling:\u003c\/strong\u003e Handles turbocharged SR20DET heat output\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll-Aluminum:\u003c\/strong\u003e Lighter than factory radiator while providing better cooling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect Fitment:\u003c\/strong\u003e Bolt-in replacement for factory radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrack Ready:\u003c\/strong\u003e Proven in drift, time attack, and road racing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eSpecifications:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Koyo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH020252N\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e N-FLO Dual Pass Radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore Thickness:\u003c\/strong\u003e 36mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Dual pass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e All-aluminum construction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 13.8 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e Japan\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eFitment Information:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eCompatible Vehicles:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e1989-1994 Nissan 180SX (SR20DET, manual transmission)\u003c\/li\u003e\n\u003cli\u003e1989-1994 Nissan Silvia S13 (SR20DET, manual transmission)\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eIMPORTANT - Manual Transmission Only:\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eThis radiator is designed for manual transmission S13 models\u003c\/li\u003e\n\u003cli\u003eWill NOT fit automatic transmission models (different radiator design)\u003c\/li\u003e\n\u003cli\u003eVerify your S13 has SR20DET engine and manual transmission before purchasing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eWhat's Included:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eKoyo N-FLO dual pass radiator\u003c\/li\u003e\n\u003cli\u003eMounting hardware (if applicable)\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eInstallation Notes:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003cli\u003eDirect bolt-in replacement for factory radiator\u003c\/li\u003e\n\u003cli\u003eDrain and properly dispose of old coolant\u003c\/li\u003e\n\u003cli\u003eUse quality coolant for optimal performance\u003c\/li\u003e\n\u003cli\u003eBleed cooling system after installation\u003c\/li\u003e\n\u003cli\u003eCheck for leaks before driving\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eDual Pass Design - Superior Cooling:\u003c\/h4\u003e\u003cp\u003eThe N-FLO dual pass design routes coolant through the radiator core twice before returning to the engine. This dual pass configuration increases the time coolant spends in the radiator, allowing for more effective heat dissipation. The result is significantly improved cooling capacity compared to single pass radiators, making it ideal for turbocharged SR20DET engines that generate substantial heat.\u003c\/p\u003e\u003ch4\u003e36mm Core Thickness:\u003c\/h4\u003e\u003cp\u003eThe 36mm core thickness provides increased surface area for heat dissipation compared to thinner factory radiators. The thicker core allows for more coolant capacity and more cooling fins, resulting in superior heat rejection. This increased capacity is essential for maintaining proper engine temperatures during hard driving, track use, or in hot climates.\u003c\/p\u003e\u003ch4\u003eAll-Aluminum Construction:\u003c\/h4\u003e\u003cp\u003eThe all-aluminum construction provides several advantages over factory copper\/brass radiators. Aluminum is lighter, more efficient at heat transfer, and more durable. The weight savings reduce front-end weight while the improved heat transfer keeps engine temperatures in check. Aluminum also resists corrosion better than copper\/brass, ensuring long service life.\u003c\/p\u003e\u003ch4\u003eDirect Fit for S13 SR20DET Manual Transmission:\u003c\/h4\u003e\u003cp\u003eThe Koyo radiator is engineered specifically for the S13 chassis with SR20DET engine and manual transmission, providing direct bolt-in fitment using factory mounting points. No modifications are required - the radiator uses factory hose connections, mounting brackets, and fan shroud. This makes installation straightforward for anyone familiar with basic cooling system work.\u003c\/p\u003e\u003ch4\u003eTrack-Proven Performance:\u003c\/h4\u003e\u003cp\u003eKoyo radiators are proven in professional motorsport including drift, time attack, and road racing. The N-FLO design has been tested under the most demanding conditions and proven to provide reliable cooling even during extended track sessions. This makes it the radiator of choice for serious S13 enthusiasts who demand the best.\u003c\/p\u003e\u003ch4\u003eWhy Koyo?\u003c\/h4\u003e\u003cp\u003eKoyo has been manufacturing premium cooling components in Japan for decades. Their radiators are known for combining superior cooling performance with reliable construction and direct fitment. Koyo radiators are trusted by professional race teams and enthusiasts worldwide for their proven performance and quality.\u003c\/p\u003e\u003ch4\u003eEssential for Turbocharged SR20DET:\u003c\/h4\u003e\u003cp\u003eThe turbocharged SR20DET engine generates significantly more heat than naturally aspirated engines, making an upgraded radiator essential for reliability. The factory radiator is often marginal even at stock boost levels, and becomes inadequate with increased boost or aggressive driving. The Koyo N-FLO radiator provides the cooling capacity needed to keep temperatures in check.\u003c\/p\u003e\u003ch4\u003eInstallation Tips:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eDrain factory coolant completely before removal\u003c\/li\u003e\n\u003cli\u003eRemove factory radiator and inspect hoses for wear\u003c\/li\u003e\n\u003cli\u003eInstall Koyo radiator using factory mounting points\u003c\/li\u003e\n\u003cli\u003eConnect all hoses and ensure proper fitment\u003c\/li\u003e\n\u003cli\u003eFill with quality coolant (50\/50 mix recommended)\u003c\/li\u003e\n\u003cli\u003eBleed cooling system to remove air pockets\u003c\/li\u003e\n\u003cli\u003eCheck for leaks and verify proper operation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003ePerfect For:\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eS13 180SX\/Silvia SR20DET owners seeking improved cooling\u003c\/li\u003e\n\u003cli\u003eTurbocharged builds with increased boost\u003c\/li\u003e\n\u003cli\u003eTrack day enthusiasts and drift cars\u003c\/li\u003e\n\u003cli\u003eAnyone experiencing overheating issues\u003c\/li\u003e\n\u003cli\u003eBuilds requiring reliable cooling performance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003ePerfect For:\u003c\/strong\u003e 1989-1994 Nissan 180SX\/Silvia S13 SR20DET manual transmission owners seeking superior cooling with Koyo N-FLO dual pass radiator and 36mm core.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e The dual pass design is essential for turbocharged SR20DET engines - especially important for track use and high-boost builds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eManual Transmission Only:\u003c\/strong\u003e This radiator is designed for MT models. Will NOT fit automatic transmission S13.\u003c\/p\u003e\u003cp\u003eUpgrade your S13 cooling with Koyo N-FLO radiator - dual pass, 36mm core, SR20DET MT, all-aluminum, improved cooling, track proven, made in Japan.\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944006996135,"sku":"KOYHH020252N","price":562.74,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/KoyoHH020252NCanada.jpg?v=1769630703"},{"product_id":"koyo-95-02-nissan-silvia-s14-s15-2-0l-turbo-radiator","title":"Koyo 95-02 Nissan Silvia S14\/S15 2.0L Turbo Radiator","description":"\u003cp\u003eManual Transmission only. 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R34 GT-R (between '98 to Aug '00 only); For R34 Non GT-R with:RB25DE, RB25DET, and RB25DE use HH020442\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944007422119,"sku":"KOYHH020879","price":590.09,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/dd0624ce33a72fb61f6b686f4dfc223cL.gif?v=1754781023"},{"product_id":"koyo-03-06-nissan-350z-3-5l-v6-radiator","title":"Koyo 03-06 Nissan 350Z 3.5L V6 Radiator","description":"\u003cp\u003eKoyorad HH021568 Racing All Aluminum Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944007487655,"sku":"KOYHH021568","price":571.73,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/s-l1200.jpg?v=1754493444"},{"product_id":"koyo-04-13-nissan-titan-armade-qx56-5-6l-v8-req-trans-cooler-radiator","title":"Koyo 04-13 Nissan Titan\/Armade\/QX56 5.6L V8 (Req. 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R34 (between Sept '00 to '02 only)\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944007848103,"sku":"KOYHH023194","price":589.08,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/c087667c85ddabca54593386825972c5L.gif?v=1754781035"},{"product_id":"koyo-97-00-mitsubishi-evolution-4-5-6-turbo-mt-radiator-for-use-with-03-07-evo-fan-shroud-only","title":"Koyo 97-00 Mitsubishi Evolution 4\/5\/6 Turbo (MT) Radiator *For use with 03-07 Evo Fan Shroud ONLY*","description":"\u003cp\u003eKoyo 97-00 Mitsubishi Evolution 4\/5\/6 Turbo (MT) Radiator *For use with 03-07 Evo Fan Shroud ONLY*\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944007979175,"sku":"KOYHH030939","price":581.49,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/734e01010d5a6cb9d81975a4ebe95415L.gif?v=1754781038"},{"product_id":"koyo-03-07-mitsubishi-evolution-8-9-2-0l-turbo-mt-radiator","title":"Koyo 03-07 Mitsubishi Evolution 8\/9 2.0L Turbo (MT) Radiator","description":"\u003cp\u003eKoyo 03-07 Mitsubishi Evolution 8\/9 2.0L Turbo (MT) Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944008044711,"sku":"KOYHH031610","price":589.08,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/9064476cd90cb96d1a8de35c31e7f822L.gif?v=1754781041"},{"product_id":"koyo-03-07-mitsubishi-evolution-7-8-9-turbo-mt-half-size-race-radiator","title":"Koyo 03-07 Mitsubishi Evolution 7\/8\/9 Turbo (MT) Half-Size RACE  Radiator","description":"\u003cp\u003eKoyo 03-07 Mitsubishi Evolution 7\/8\/9 Turbo (MT) Half-Size RACE  Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944008110247,"sku":"KOYHH032412","price":519.22,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/d3023f6490722e44e2785eebba584ccaL.gif?v=1754781044"},{"product_id":"koyo-86-88-mazda-rx-7-fc-na-turbo-mt-radiator","title":"Koyo 86-88 Mazda RX-7 FC NA\/Turbo (MT) Radiator","description":"\u003cp\u003eKoyo 86-88 Mazda RX-7 FC NA\/Turbo (MT) Radiator\u003c\/p\u003e","brand":"Koyo","offers":[{"title":"Default Title","offer_id":46944008175783,"sku":"KOYHH060642","price":536.17,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/8344\/1063\/files\/08645f63a778ed428ae6614c6bfa50d4L.gif?v=1754781047"},{"product_id":"koyo-89-92-mazda-rx-7-1-3l-late-fc-chassis-turbo-non-turbo-radiator","title":"Koyo High Performance Radiator - 1989-1992 Mazda RX-7 FC (Late Chassis) | Turbo \u0026 Non-Turbo, Manual Transmission (HH060643)","description":"\u003ch3\u003eKoyo High Performance Radiator - 1989-1992 Mazda RX-7 FC (Late Chassis) | Turbo \u0026amp; Non-Turbo, Manual Transmission (HH060643)\u003c\/h3\u003e\n\u003cp\u003eUpgrade your late FC RX-7's cooling system with the Koyo high performance radiator. Engineered for the 1989-1992 Mazda RX-7 FC late chassis in both turbo and non-turbo configurations, this Koyo radiator features an increased-thickness high performance core for superior cooling capacity over the factory radiator — essential for the heat-sensitive 13B rotary engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant fitment notes before ordering:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual transmission only\u003c\/strong\u003e — not compatible with automatic transmission RX-7\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM side brackets required\u003c\/strong\u003e — use your factory Series 4 or Series 5 specific brackets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLate FC chassis only\u003c\/strong\u003e — fits 1989-1992 (Series 5\/6); verify your chassis before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIntake snorkel modification may be required\u003c\/strong\u003e — increased core thickness may require modification or removal of OEM intake snorkel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eIncreased-thickness high performance core\u003c\/li\u003e\n\u003cli\u003eSuperior cooling capacity over factory radiator\u003c\/li\u003e\n\u003cli\u003eFits turbo and non-turbo FC RX-7\u003c\/li\u003e\n\u003cli\u003eManual transmission fitment\u003c\/li\u003e\n\u003cli\u003eUses OEM side brackets (Series 4\/5 specific)\u003c\/li\u003e\n\u003cli\u003e14.8 lb complete unit\u003c\/li\u003e\n\u003cli\u003eKoyo quality and engineering\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003ePerformance Benefits:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Core Thickness:\u003c\/strong\u003e Greater coolant volume and surface area for superior heat rejection\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Cooling:\u003c\/strong\u003e Keeps the heat-sensitive 13B rotary engine at safe operating temperatures\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTurbo \u0026amp; Non-Turbo:\u003c\/strong\u003e Single part number covers both configurations\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Construction:\u003c\/strong\u003e Koyo's proven radiator engineering and materials\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReliability:\u003c\/strong\u003e Reduces risk of overheating on modified or high-performance FC builds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSpecifications:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Koyo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e HH060643\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e High Performance Radiator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCore:\u003c\/strong\u003e Increased thickness high performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransmission:\u003c\/strong\u003e Manual only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 14.8 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBarcode:\u003c\/strong\u003e 847839010998\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eFitment Information:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1989-1992 Mazda RX-7 FC (Late Chassis \/ Series 5-6)\u003c\/strong\u003e - Turbo (13B-T) and Non-Turbo (13B)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManual transmission only\u003c\/strong\u003e — automatic transmission not supported\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM side brackets required:\u003c\/strong\u003e Use factory Series 4 or Series 5 specific side brackets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Increased core thickness may require modification to OEM intake snorkel for fitment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Verify your FC chassis year (late vs. early) before ordering — this fits late chassis (1989-1992) only\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Professional installation recommended\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhat's Included:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eKoyo high performance radiator (HH060643)\u003c\/li\u003e\n\u003cli\u003eInstallation instructions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e OEM side brackets not included — reuse factory brackets\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Coolant sold separately — flush and refill required after installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eInstallation Notes:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended\u003c\/li\u003e\n\u003cli\u003eDrain factory coolant before removal\u003c\/li\u003e\n\u003cli\u003eRemove OEM radiator and retain side brackets for reuse\u003c\/li\u003e\n\u003cli\u003eCheck OEM intake snorkel clearance — modification may be required due to increased core thickness\u003c\/li\u003e\n\u003cli\u003eTransfer OEM side brackets to Koyo radiator\u003c\/li\u003e\n\u003cli\u003eInstall Koyo radiator using OEM mounting points\u003c\/li\u003e\n\u003cli\u003eRefill with fresh coolant (50\/50 mix recommended)\u003c\/li\u003e\n\u003cli\u003eBleed cooling system thoroughly to remove air pockets\u003c\/li\u003e\n\u003cli\u003eCheck for leaks and verify coolant temperature at operating temperature before driving hard\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eWhy Upgrade the FC RX-7 Radiator?\u003c\/h4\u003e\n\u003cp\u003eThe Mazda RX-7 FC's 13B rotary engine is notoriously heat-sensitive. Unlike piston engines, the rotary's apex seals and rotor housings are highly susceptible to damage from sustained elevated coolant temperatures. The factory radiator is adequate for stock power levels in good condition, but as the radiator ages, becomes clogged, or as the engine is modified for more power, the factory unit's cooling capacity can become insufficient. An overheating 13B can suffer apex seal failure, warped rotor housings, and other serious internal damage that is expensive to repair. Upgrading to a Koyo high performance radiator with increased core thickness provides the additional cooling capacity needed to keep the 13B at safe operating temperatures under all conditions.\u003c\/p\u003e\n\u003ch4\u003eIncreased Core Thickness - Why It Matters:\u003c\/h4\u003e\n\u003cp\u003eThe Koyo radiator features an increased-thickness core compared to the factory unit. A thicker core contains more coolant volume and provides greater surface area for heat transfer to the passing airflow. This translates directly to improved heat rejection capacity — the radiator can remove more heat from the coolant per unit of time, keeping coolant temperatures lower under demanding conditions. For the FC RX-7, this additional cooling capacity is particularly valuable during track use, spirited driving, or in hot weather conditions where the factory radiator may struggle to maintain safe coolant temperatures.\u003c\/p\u003e\n\u003ch4\u003eLate FC Chassis - Series 5 and 6 (1989-1992):\u003c\/h4\u003e\n\u003cp\u003eThe Mazda RX-7 FC was produced from 1986 to 1992 in two distinct chassis generations. The early FC (Series 4, 1986-1988) and late FC (Series 5-6, 1989-1992) have different radiator dimensions and mounting configurations. The Koyo HH060643 is designed for the late FC chassis (1989-1992) only. The OEM side brackets are Series 4 or Series 5 specific, meaning the correct brackets from your specific FC must be used. If you are unsure of your FC's series, verify by the production year — 1989-1992 models are late chassis.\u003c\/p\u003e\n\u003ch4\u003eManual Transmission Only:\u003c\/h4\u003e\n\u003cp\u003eThe Koyo HH060643 is designed for manual transmission FC RX-7 only. Automatic transmission FC models use a different radiator with integrated automatic transmission fluid (ATF) cooler lines. The Koyo radiator does not include ATF cooler provisions, making it incompatible with automatic transmission vehicles. Verify your FC's transmission type before ordering.\u003c\/p\u003e\n\u003ch4\u003eOEM Intake Snorkel Modification:\u003c\/h4\u003e\n\u003cp\u003eThe increased core thickness of the Koyo radiator may require modification to the OEM intake snorkel — the plastic duct that routes air from the front of the engine bay to the air filter. The thicker core occupies more space in the engine bay, potentially conflicting with the snorkel's routing. In some cases, the snorkel can be trimmed or repositioned; in others, it may need to be removed entirely and replaced with an aftermarket intake. This is a known fitment consideration for thicker-core radiators on the FC RX-7 and should be planned for before installation.\u003c\/p\u003e\n\u003ch4\u003eCooling System Maintenance for the 13B:\u003c\/h4\u003e\n\u003cp\u003eWhen installing a new radiator on an FC RX-7, take the opportunity to service the entire cooling system. Flush the old coolant completely, inspect the thermostat and replace if it has not been recently serviced, inspect all coolant hoses for cracks or swelling, and check the water pump for leaks or bearing play. The 13B's sensitivity to overheating makes a well-maintained cooling system essential — a new radiator paired with fresh coolant, a new thermostat, and good hoses provides the best foundation for reliable operation.\u003c\/p\u003e\n\u003ch4\u003eWhy Koyo?\u003c\/h4\u003e\n\u003cp\u003eKoyo is a Japanese manufacturer of high-performance radiators and cooling components, trusted by enthusiasts and professional race teams worldwide. Their radiators are engineered for each specific application, providing correct fitment and optimized cooling performance. Koyo's extensive coverage of Japanese performance platforms, including the Mazda RX-7, ensures their radiators are engineered to the correct specifications for reliable, long-term performance.\u003c\/p\u003e\n\u003ch4\u003ePerfect For:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e1989-1992 Mazda RX-7 FC (late chassis) manual transmission builds needing improved cooling\u003c\/li\u003e\n\u003cli\u003eTurbo and non-turbo FC RX-7 builds wanting Koyo radiator upgrade\u003c\/li\u003e\n\u003cli\u003eFC RX-7 track day and performance builds requiring reliable 13B cooling\u003c\/li\u003e\n\u003cli\u003eFC RX-7 cooling system refreshes replacing aged factory radiator\u003c\/li\u003e\n\u003cli\u003eAnyone seeking Koyo quality for their late FC RX-7 cooling upgrade\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePerfect For:\u003c\/strong\u003e 1989-1992 Mazda RX-7 FC late chassis (manual transmission) owners seeking Koyo high performance radiator for improved 13B cooling capacity on turbo and non-turbo builds.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Replace the thermostat, coolant hoses, and flush the entire cooling system at the same time as the radiator — the 13B's sensitivity to overheating makes a complete cooling system refresh worthwhile whenever the radiator is out.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e Manual transmission only. OEM Series 4\/5 side brackets required (not included). Late FC chassis (1989-1992) only. 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