These Noble OE style paint - matched exhaust finishers are a great addition to your 2015 - 2021 Subaru WRX or STI. To install them, first, clean the area where you'll put the finishers. Make sure it's free of dust, debris, and wax. Then, use the 3M double - sided adhesive that comes with the product to attach the finishers. It's quick and easy, taking just seconds. Remember, they may not fit all diffusers and rear spats. If that's the case, you might need to make some modifications. For maintenance, just keep them clean. Wipe them down regularly to keep their painted finish looking great. And don't worry, we offer a 1 - year warranty against manufacturing defects, so you can enjoy your new exhaust finishers with peace of mind.