APR Carbon Fiber Radiator Cooling Shroud 2006-2007 Subaru WRX/STIThe flow of air is not only limited to the outside of your 2006 2007 Subaru WRX STI. To maximize cooling capabilities, a radiator needs a direct flow of air to allow an engine to maintain consistent temperatures on the race track. Because of structural gaps above the radiator, the flow of air could escape making the radiator not as efficient as it could be. To help improve the flow of air into the radiator, APR Carbon Fiber Radiator Cooling Plates can