Feature: Shorty muffler measures 12″ long; Inlet diameter: 1.1/2 (38) or 1.3/4 (45mm) simply swap ends Outside Diameter: 2 3/8″ Material:Steel Color:Black NOTE: These mufflers no longer include reducers, as each end of the muffler is a different size Fitment: Mufflers are universal, all fit left or right side.