For Chevy Corvette LS1/LS6 5.7 V8 Stainless Steel Header Exhaust X-Pipe Dyno Proven Increases Low End Torque and Horse Power Removes Catalytic Converter from Pipes Aggressive Deep Sound while Ensures Smooth Exhaust Gas Flow Inlet: 3" ID V-Band Flange / Outlet: 2.25" ID / O2 Sensor Bung Insertion and Gasket Included Application: 97-04 Chevy Corvette 5.7L V8 (Instruction NOT Included, Professional Installer is Highly Recommended)