3-piece slip-fit sleeves are used to reduce the inner muffler diameter from 1-3/4″ (44.5mm) to 1-1/2″ (38.1mm) in 3 steps. This will enable installation of regular 1-3/4″ diameter mufflers, for instance, onto 1-1/2″ head pipes. Comes with 3 different sleeve thicknesses, allowing you to find the best possible fit.
