Give your 2015 - 2017 5.0L Mustang GT the signature ROUSH Performance sound, powerful looks, and boosted performance with this ROUSH Performance Cat - Back exhaust system. This 2015 - 2017 ROUSH Performance Cat - Back exhaust system is constructed of corrosion - resistant 304 stainless steel and is mandrel bent for high - performing airflow. This ROUSH Performance Cat - Back exhaust kit improves flow and reduces back pressure in your Mustang's exhaust system thanks to hours of RampD, testing, and validation. This system includes a mandrel - bent x - pipe, mid - pipes, and dual high flow mufflers that improve the sound, performance, and flow characteristics of the Mustang's V8 powerhouse, as well as ROUSH branded polished 304 stainless steel tips.ROUSH Performance recommends checking your local noise ordinances levels prior to purchase.