Ford Performance Active Sport Cat back ExhaustEnhance your Focus RS's performance and add an aggressive exhaust tone with this Active Sport Cat Back Exhaust System from Ford Performance. This stylish American made exhaust kit will also give your RS a unique and custom look! Features: Fits 2016 2018 Focus RS Uniquely designed and tuned to provide optimum performance, aggressive sound, durability and pure driving excitement Retains the factory active exhaust control with a 2. 5 NPP valve