HKS Downpipe – 1987–1993 Toyota Supra MK3 MA70 | 7M-GTE Turbo Exhaust Downpipe

The HKS Downpipe for the 1987–1993 Toyota Supra MK3 MA70 is a direct-fit performance downpipe engineered for the 7M-GTE turbocharged inline-six — replacing the factory downpipe with a less-restrictive HKS unit that reduces exhaust backpressure at the turbocharger outlet, improving turbo spool, exhaust flow, and overall 7M-GTE performance. The MA70 Supra's factory downpipe is a significant restriction point in the 7M-GTE's exhaust system — its smaller diameter and restrictive bends limit exhaust gas evacuation from the turbocharger, increasing backpressure and slowing spool. HKS's downpipe addresses this directly, and as one of Japan's most respected and longest-established performance brands with deep 7M-GTE development history, HKS is the correct brand for MA70 Supra exhaust upgrades.

Key Features:

• Reduced exhaust restriction — less-restrictive downpipe design reduces exhaust backpressure at the 7M-GTE's turbocharger outlet — improved turbo spool, exhaust flow, and power delivery
• Direct-fit design — engineered for the 1987–1993 Toyota Supra MK3 MA70 7M-GTE — direct replacement for the factory downpipe using the factory mounting points
• Improved turbo spool — reduced exhaust backpressure allows the 7M-GTE's turbocharger to spool more quickly — more responsive power delivery from lower RPM
• Reduced exhaust gas temperatures — improved exhaust flow reduces EGTs under load — a meaningful benefit for boosted 7M-GTE builds where elevated EGTs are a concern
• HKS quality — manufactured by HKS, one of Japan's most respected and longest-established performance brands with extensive 7M-GTE and MA70 Supra development experience

Why the MA70 Supra 7M-GTE Needs a Downpipe Upgrade:

• Factory Downpipe Restriction: The MA70 Supra's factory 7M-GTE downpipe is engineered for emissions compliance and NVH management rather than performance exhaust flow. Its smaller diameter and restrictive bends create backpressure that the turbocharger must work against to evacuate exhaust gases — slowing spool, increasing EGTs, and limiting the 7M-GTE's performance potential. On a platform as capable as the MA70 Supra, the factory downpipe is one of the most impactful single exhaust upgrades available.
• 7M-GTE Turbo Spool: The 7M-GTE's factory turbocharger is known for relatively lazy spool characteristics in stock form — a characteristic that is significantly influenced by exhaust backpressure at the turbine outlet. Reducing backpressure with a less-restrictive downpipe allows the turbine to spin up more freely, improving spool response and delivering boost pressure earlier in the RPM range. For MA70 Supra owners who want improved throttle response and mid-range power delivery, the downpipe is the correct first exhaust upgrade.
• Foundation for Further Upgrades: The downpipe is the most impactful single exhaust component upgrade on a turbocharged engine — its position immediately downstream of the turbocharger makes it the highest-restriction point in the exhaust system. Upgrading the downpipe first maximizes the benefit of any subsequent exhaust system upgrades (cat-back, muffler, etc.) by removing the primary restriction point.

Specifications:

• Brand: HKS
• Part Number: HKS3103-RT003
• Barcode: 3103-RT003
• Application: 1987–1993 Toyota Supra MK3 MA70 — 7M-GTE
• Weight: 14.8 lbs

Fitment Information:

• 1987–1993 Toyota Supra MK3 — MA70 chassis — 7M-GTE turbocharged inline-six
• Note: This downpipe is for the 7M-GTE turbocharged variant only — not compatible with the naturally aspirated 7M-GE. Verify your specific MA70 Supra engine variant before ordering. Professional installation by an experienced exhaust fabricator or performance shop strongly recommended.
• Emissions note: Verify compliance with local emissions regulations before installation. Downpipe modifications may affect emissions system components including the catalytic converter. This product is intended for off-road and competition use where permitted by local regulations.

What's Included:

• HKS downpipe — 1987–1993 Toyota Supra MK3 MA70 7M-GTE (HKS3103-RT003)
• Refer to HKS's product documentation for complete hardware contents

Installation Notes:

• Professional installation by an experienced exhaust fabricator or performance shop strongly recommended — downpipe replacement on the 7M-GTE requires correct torque specifications and correct gasket/seal installation at the turbocharger outlet and downstream connections
• Use new gaskets and seals at all connection points — reusing old gaskets risks exhaust leaks that affect performance and generate cabin odour
• Allow the exhaust system to cool completely before installation — the 7M-GTE's exhaust components retain heat for an extended period after engine shutdown
• Check all connections for exhaust leaks after installation and after the first heat cycle — thermal expansion can loosen connections on initial use
• The MA70 Supra's 7M-GTE is known for head gasket issues — inspect the head gasket condition before and after downpipe installation. Any exhaust leak at the head gasket will affect downpipe performance and should be addressed before or alongside the downpipe upgrade.

Why HKS?

HKS is one of Japan's most respected and longest-established performance brands — founded in 1973 and known for their turbochargers, exhaust systems, engine management, and performance accessories for a wide range of Japanese performance platforms. HKS has a long history of development on the 7M-GTE and MA70 Supra platform — one of the most iconic Japanese performance cars of the late 1980s and early 1990s — and their MA70 Supra downpipe reflects that platform-specific development experience. For MA70 Supra owners who want a quality downpipe upgrade from a brand that genuinely understands the 7M-GTE's performance requirements, HKS is the correct choice.

Perfect For:

• 1987–1993 Toyota Supra MK3 MA70 7M-GTE owners seeking improved turbo spool, reduced EGTs, and better exhaust flow as a foundation for 7M-GTE performance upgrades
• MA70 Supra builds where the factory downpipe's restriction is limiting the 7M-GTE's performance potential and turbo response
• Owners completing a comprehensive MA70 Supra exhaust upgrade — pairing the HKS downpipe with a cat-back exhaust system for a complete exhaust flow improvement
• 7M-GTE builds where HKS's brand heritage and MA70 Supra development history make them the correct exhaust upgrade choice

Emissions Note: Verify compliance with local emissions regulations before installation. Intended for off-road and competition use where permitted. 7M-GTE variant only — not compatible with 7M-GE. Professional installation recommended. Inspect head gasket condition before installation — the 7M-GTE's known head gasket issues should be addressed before or alongside exhaust upgrades.