J2 Engineering For Corolla Stainless Steel Racing Catback Exhaust System - 4A/7A-FE E100 Made of High Quality T-304 Stainless Steel with Computerized Mandrel-Bends for Strength and Durability i.e. Maximizing Smoothest High Exhaust Air Flow Rate 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 3.5" Slant Rolled Muffler Tip Design; Inlet: 2.375"; Gaskets and Hardware Included