The Proto Performance aluminium radiator for the Subaru WRX and STI is designed and engineered to maximize cooling efficiency by up to 30%, boost engine functions, and most importantly protect your car from overheating. It is the ideal upgrade to the stock Subaru radiator whether you drive your vehicle daily or take it for track runs. The Proto wrx radiator features a lightweight dual core, 100% brazed aluminium, and polished end tanks, enhancing the overall performance of your engine. Every Proto aluminium radiator is a direct OEM fit making installation effortless with no cutting or modification required. All Proto radiators come with a high pressure 1.3 bar Proto radiator cap and a great warranty including accident protection.