Features: 1: 38mm Merge Headers for up to 200HP. 2: Calculated firing orderfor Max Torque and HP. 3: 150mm Diameter muffler for Max Power Plus Quiet. 4: Two threaded O2 sensor slots to fulfill all your needs. 5: X-pipe SUPER FLOW chamber. 6: Tail pipes Wrapped with Stainless steel mat, for long life. 7: Use Original Porsche Gaskets, Gaskets did not include. 8: All #304 Stainless Steel. 9: Muffler Support Clamps included.