Give your 2018 5.0L Mustang GT an aggressive race - inspired sound and powerful looks, and boost performance with this ROUSH Performance Axle - Back Exhaust System. This 2018 ROUSH Performance Axle - Back Exhaust System is constructed of corrosion - resistant T - 304 stainless steel, and is mandrel - bent for high - performing airflow. Thanks to hours of research and development, testing, and validation, this system improves flow and reduces back pressure. Along with quad polished T - 304 stainless steel tips, this system includes dual high - flow mufflers that improve the stock sound, performance, and flow characteristics of the Mustang's V8 powerhouse.