Cobra Race Pro Slip-On Mufflers for Dressers 1995-2013 Touring models - 4" 4&rsquo;&rsquo; round muffler front expands just at the rear to reach a 4.5&rsquo;&rsquo; diameter, capped off by a thin line black tip that is held in place with 7 stainless steel aircraft-style, 12-point bolts Black finish on the tip is matched with the black finish on the laser-cut steel strap that tightly encircles the muffler Race Pro mounts the same way as nearly every slip-on muffler from Cobra. The strap clamps tightly around the muffler and bolts to the bike&rsquo;s hanger mounts located beneath the saddlebags PEM fasteners in the wrap make mounting a simple task of threading in a bolt from the upper bracket into the Cobra strap High-flo core is a massive 3.5&rsquo;&rsquo; in diameter which gives the muffler an aggressive look and are encased in proprietary Cobra sound tuning materials with specific acoustical dampening and thermal insulation properties