Performance exhaust and muffler for QMB139 50cc scootersProduct description:Muffler length: 14" including exhaust tipMuffler diameter: 3.5"Pipe OD: 25mm Pipe ID: 22.5mmPipe mounting to manifold: 2"Muffler has replaceable screw in silencer plug6 mounting holes to mount pipe to muffler allowing you to position the outlet  pipe - only 3 bolts actually usedInlet pipe is 22" long with 4 bends:1st bend is 4.5" from manifold2nd bend is 4"6" run to the 3rd bend6" to the muffler attachmentKit contains muffler mounting bracket and insulator, exhaust pipe gasket (2.5" round, 3-hole), 4 bolts, 4 washers, 1 lock washer and 1 nut. *MAY require some modifications to the inlet bracket on some scooters.Comes in different colors: BLACK, BLUE, SILVER, or RED