Using this Subaru carbon fiber trunk piece is super easy. First, make sure your trunk area is clean. Then, take the piece with the pre - applied 3M double - sided adhesive and carefully place it over the factory color - coded piece on your trunk. It should stick right on and you'll be done in a couple of minutes. As for the warranty, only get the part installed at a CERTIFIED Subaru Dealership and ensure the part matches your vehicle's VIN. For maintenance, just clean it with a soft cloth and some mild automotive cleaner. Avoid using harsh chemicals that could damage the carbon fiber or the 'STI' logo.