Koyorad Aluminium Racing Radiator - Subaru WRX/STI (GRB/GVB/VA)

Koyo's racing radiators are built for exactly the kind of heat cycles that push a factory cooling system to its limits. Where most OEM radiators rely on plastic tanks that crack and weep over time, Koyo constructs this unit entirely from aluminium — giving you a radiator that can actually be repaired if damaged, and one that will outlast the car it's fitted to. A thicker core, precise tube and fin alignment, and NoClock furnace brazing throughout make this a serious upgrade for any Subaru WRX or STI owner running their car hard.

This listing covers the Koyo Aluminium Racing Radiator (manual transmission) for the 2008–2021 Subaru WRX/STI, including the GRB, GVB, and VA chassis platforms.

Important: This radiator is designed for manual transmission vehicles only. It is not compatible with automatic transmission applications.

Key Features

• Full aluminium construction — stronger and more repairable than OEM plastic-tank radiators
• Heli-arc welded aluminium connections for added structural integrity
• Thicker core for improved heat dissipation under sustained load
• Precise tube and fin alignment for optimal coolant flow and heat transfer efficiency
• NoClock furnace brazing on tubes, fins, headers and brackets — bonds all components to resist vibration, road debris and the elements
• Billet filler neck precision machined for long term durability
• Manual transmission fitment

Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please ensure your vehicle's year, trim level, and transmission type are confirmed before ordering.

Not sure if this radiator suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.