Ford Performance Active Cat-Back Sport Exhaust System 2016-2017 Focus RSFord Performance crafts their cat back exhaust system from premium quality 304 stainless steel. It retains the RS's stock active exhaust control with a 2 1 2" NPP valve and will add an aggressive exhaust note. This exhaust kit is tuned and engineered to give a performance upgrade in order to improve the driving experience. The 3" exhaust pipe features smooth mandrel bends and warp free flanges. The stylish dual rear exit exhaust sports chrome plated