Use this rear diffuser when you're looking to enhance the performance and style of your 2002 - 2007 Subaru Impreza WRX STI 4DR. It's perfect for car enthusiasts who want to add a touch of sportiness to their vehicles. The diffuser is made of FRP material, which is lightweight yet strong. While specific size and weight details aren't given, you can expect it to fit neatly on your car's rear end and make a real statement on the road.