DNA Motoring CBE-CCBT05-BT CBECCBT05BT Stainless Steel 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; increase engine output and efficiency 3.5"(Od) Muffler exhaust tip; inlet: 2.25"; main piping diameter: 2.25"