This fuel cap is perfect for Subaru enthusiasts who own a 2004 - 2005 Impreza WRX STI 4DR. It's great for both daily driving and car shows. The cap is made of FRP, which gives it strength and durability. It's designed to fit seamlessly with the C - GT wide body style of your Subaru, adding a touch of style to your vehicle. You'll need to use it with a complete wide body kit and get it professionally installed.