Koyo N-FLO Dual-Pass All-Aluminum Radiator – 1993–1995 Mazda RX-7 FD3S | 13B-REW Twin Turbo

Maximize cooling performance in your FD3S RX-7 with the Koyo N-FLO Dual-Pass All-Aluminum Radiator — Koyo's premium cooling solution for the 13B-REW twin-turbo rotary. The N-FLO dual-pass design routes coolant through the radiator core twice before returning to the engine, effectively doubling the cooling surface area and dwell time compared to a conventional single-pass radiator. Combined with full aluminum construction for superior heat transfer over OEM copper/brass, the N-FLO delivers the maximum cooling capacity available in a direct-fit FD3S radiator — essential for any RX-7 running modified power, track use, or warm-climate driving.

Key Features

• N-FLO Dual-Pass Design: Koyo's patented dual-pass core routes coolant through the radiator twice before returning to the engine — effectively doubles the cooling surface area and dwell time for dramatically improved heat rejection versus single-pass OEM and aftermarket radiators
• All-Aluminum Construction: Full aluminum core and tanks — superior heat transfer compared to OEM copper/brass construction, lighter weight, and excellent long-term durability
• Maximum Cooling Capacity: The highest cooling capacity available in a direct-fit FD3S radiator — the definitive choice for modified, track-driven, or thermally demanding RX-7 builds
• Direct Fit: Engineered specifically for the 1993–1995 Mazda RX-7 FD3S — uses OEM mounting points and hose connections for a straightforward installation without modification
• Koyo Quality: Manufactured by Koyo — a globally recognized OEM and performance cooling supplier trusted by enthusiasts and professional race teams worldwide

Specifications

• Type: All-Aluminum Racing Radiator
• Design: N-FLO Dual-Pass
• Material: All Aluminum
• Fitment: 1993–1995 Mazda RX-7 FD3S — 13B-REW 1.3L Twin Turbo Rotary
• Part Number: HH060644N

Note: This is the N-FLO dual-pass version (HH060644N). For the standard single-pass aluminum radiator, see HH060644. A coolant flush and fresh fill is recommended at installation. Professional installation recommended.