For Mini Cooper S R50 Stainless Steel 3" Dual Muffler Tip Catback Exhaust System Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability Dyno Proven to Instantly Increases 10 -20 Horsepower/ Low End Torque TIG Welded CNC Machine Flange for Resistance against Pressure and Corrosion Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow 3" Dual Muffler Tip / 2.5" Inlet / 2.5" Main Piping Diameter