Can be used on both left and right side. Universal muffler, 20″ (50.8 cm) long, with an inside diameter of 1-3/4″ (4.4 cm) and outside diameter of 2-1/2″ (6.4 cm) for use on 1-3/4″ diameter headers. Does not have a slider channel. Mounts with 2-1/2″ diameter clamp. Note: Dimensions are mentioned for reference only.