The Mishimoto Subaru WRX and STI Air Diversion Plate is not only intended to enhance the aesthetic appeal of your engine, but will incomparably reduce your radiator�s coolant temperature. Every Mishimoto air diversion plate is constructed of 5052 aluminum and are available in several finishes. Choose from a natural brushed matte or an anodized glossy black or blue to enhance the look and style of your Subaru's engine bay.