Features: 1) Especially for the U.S. "Kangmins" engine exhaust systems 2) Installed between engine and exhaust end hose 3) Used to decrease engine noise and vibration (with flanges) 4) Absorbs muffler pipe thermal expansion 5) Compensates for exhaust converter misalignment 6) Reduces air pollution 7) Size, diameter and length can be produced as per clients requirements