Emgo E8003310B Shorty 12" Muffler Flat Black (Each)Emgo Universal Shorty Muffler Shorty muffler measures 12 in. long; includes reducer set for 1 1 2 in. or 1 3 4 in. pipes Each end of muffler is a different size, 1 1 2 in. or 1 3 4 in. NOTE: These mufflers no longer include reducers, as each end of the muffler is a different size Length: 12" Inlet Outlet ID's: 1 1 2"&1 3 4" Outside Diameter: 2 3 8"