Using this carbon fiber trunk finish is super easy. First, find your factory color - coded trunk piece. Then, take the carbon fiber piece that has pre - applied 3M double - sided adhesive. Simply place it over the factory piece and press it down firmly. It should take only a minute or two. When it comes to the warranty, make sure to have the part installed by a CERTIFIED Subaru Dealership and ensure the part matches your vehicle's VIN. For maintenance, just clean it with a soft cloth and mild automotive cleaner. Avoid using harsh chemicals that could damage the carbon fiber or the 'STI' logo.