Koyorad Racing Aluminium Radiator | Subaru WRX & STI GC8 (1994 -2000) | Liberty RS (1991-1994)

The Koyorad Racing Aluminium Radiator is a direct-fit upgrade for your GC8 WRX or STI, built to keep the EJ20 cool through spirited driving, track days and gravel-road punishment alike. Hand-TIG-welded in Japan from all-aluminium construction, it drops straight into the factory mounting points for a clean, no-fuss install with a serious step up in cooling performance.

A Rally Icon Deserves Better Than a 30-Year-Old Radiator

The EJ20 was built to handle serious boost, but a factory plastic-tank radiator on a GC8 this age is decades old and was never built for a lifetime of hard driving. Heat soak on track or in traffic shows up fast on a highly strung turbo boxer.

A Cooling System Built for Real Punishment

Koyo's 36mm core is engineered with optimised fin density and tube design to move more heat out of the system, backed by a full-aluminium, TIG-welded build that shrugs off the vibration and heat-cycling that kills OEM plastic tanks over time. Every unit is pressure-tested before it leaves the factory.

Cooler Coolant, More Confidence on Track

With stable coolant temps locked in, you get consistent power lap after lap, less risk of overheating under sustained boost, and a radiator tough enough to handle whatever's next for your GC8 | more boost, more track days, more seat time.

Key Features

• All-aluminium construction with TIG-welded tanks for maximum durability
• 36mm core for increased cooling capacity over the factory unit
• Optimised fin density and tube design for efficient heat transfer
• Direct-fit design | uses factory mounting points and fan shroud, no modifications required
• Compatible with standard radiator caps and coolant hoses (unless otherwise specified)
• Pressure-tested for reliability under sustained high load and temperature
• Ideal foundation for further performance upgrades, including higher boost levels and track use
• Made in Japan

Specifications