For Ford Mustang GT 4.6L Catback Exhaust System 3.75" Dual Muffler Tip - 5th Gen FR Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Dyno Proven to Instantly Increases 15 - 25 Horsepower/ Low End Torque TIG Welded CNC Machine Flange for Resistance against Pressure and Corrosion Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow; Increase Engine Output and Efficiency 3.75"(OD) Dual Muffler Exhaust Slanted & Rolled Tip; Inlet: 2.5"; Main Piping Diameter: 2.5"