Using this bumper overlay is easy. Just place the upper and lower pieces on your 2015 - 2017 Subaru WRX or STI pre - facelift bumper. When it comes to maintenance, for the 3D Carbon material, never apply wax. Instead, use normal soap and water to clean it. This will help keep the overlay looking great for years. Remember, the set comes with one upper and one lower piece. And it'll make your vehicle look much more unique compared to stock ones.