Muffler/ Exhaust Cover/ Connections 42501: Neoprene muffler, 76.2mm Dia. x 142.8mm, 215.9mm(L), I/O size: 44.4mm 42502: Neoprene muffler, 114.3MM Dia. x 177.8mm, 336.5(L), I/O size: 79.3mm 42511: Rubber exhaust cover, 63.5mm / 73mm 42512: Rubber exhaust cover, 88.9mm / 98.4mm 42521: Neoprene connection w/S.S. flange, 38.1mm 42522: Neoprene connection w/S.S. flange, 50.8mm/ 60.3mm 42523: Neoprene connection w/S.S. flange, 76.2mm / 88.9mm |