Using your Subaru OEM exhaust finisher is simple. First, locate the exhaust exits on the rear bumper of your 2022 Subaru WRX. Then, carefully place the exhaust finisher over the top of the exhaust exits and align it properly. Once aligned, it should fit snugly onto the rear bumper. When installing, make sure to handle the finishers gently to avoid any scratches. As for maintenance, it's a good idea to clean the finishers regularly with a mild car - cleaning solution and a soft cloth. This will keep them looking great and functioning well. Avoid using abrasive cleaners or tools as they can damage the finish. If you notice any signs of wear or damage, it's best to contact Subaru or a professional mechanic for advice.