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Unique open-chambered design provides increased horsepower and torque by increasing airflow and reducing back pressure. Distinct aggressive sound. 409 stainless steel pipes and muffler. polished stainless steel tips. Installation is quick and easy. Uses factory hanger locations. No vehicle modifications are required. Does not negatively affect emissions. Fits both Ford factory and ROUSH rear valance. No in-cockpit boom/drone. 3 Year Limited Warranty. Fits manual and automatic. Tips have oval-shaped openings: 4" x 4.5". Includes the following: (1) LH Muffler Assembly, (1) RH Muffler Assembly, (2) Roush Tips, (2) Round, Chrome Exhaust Tips featuring the 3.7 logo (2) Inlet Pipe Spherical Clamps, (2) Exhaust Tip Clamps, (1) Installation Manual Includes two sets of tips. Comes with Roush Tips and extra set of "3.7" logo tips