APR Performance designed a Pre-preg Carbon Fiber Radiator Cooling Plate to maximize cooling capabilities for your WRXAnd STI. A radiator needs a direct flow of air to allow an engine to maintain consistent temperatures on the race track. Because of the structural gaps above the stock radiator, the flow of air could escape making the radiator not as efficient as it could be. APR Carbon Fiber Radiator Cooling Plates can be utilized to channel the flow of air directly to the radiator which will ultimately improve the efficiency of the radiator while adding a high-tech, race inspired look to your engine bay.