The RS-4 Slip-On uses the same technology that goes into our Full Systems, but features an easier-to-install application. Each Slip-On muffler features 20-gauge 304 Stainless Steel CNC rolled and robot-welded canister shells, with a carbon fiber cone end-cap. It also features an anodized, CNC mounting bracket and articulating silicone-rubber mounting bushings. In addition, the RS-4’s premium muffler packing helps meet the USFS noise specifications. The RS-4 comes with USFS approved spark arrester installed.