Simons Muffler Duo - 63,5mm Exhaust System Mufflers Supply BOOST Products Decibel Insert 76mm Lowers the exhaust Volume Made of stainless steel for 76mm exhaust systems With the db Insert loud exhaust systems can be silenced. The Insert is to be thread in or welded in the tail pipe or hidden in a connection point of the exhaust system. Material: aluminized steel Length: 290mm Diameter: 73mm outside (largest spot)