Aluminum Racing Radiator

The Koyo Aluminum Racing Radiator is engineered to enhance the cooling performance of your Subaru WRX or STI (2003-2007) with a manual transmission. Constructed entirely from aluminum, this radiator offers superior durability over factory plastic-tank units, which are prone to expansion and failure under heat cycles. The all-aluminum build also allows for future welding and repairs, potentially making it the last radiator you'll need to purchase. Key construction details include Heli-arc welding for robust aluminum connections, a thicker core, and precise tube and fin alignment to optimize coolant flow and heat transfer. It also features NoClock Brazing, a state-of-the-art furnace bonding process that ensures components resist damage from vibration and road debris. The billet filler neck is precision-machined for lasting durability. This radiator includes a 1/8PT female accessory fitting, supplied with a threaded plug. Installation notes indicate that the upper radiator hose may require trimming for proper clearance. Additionally, owners of early model WRX vehicles should verify if their stock radiator has a cap; those without one will require the 2002 WRX radiator.