Big Gun Evo Utility Series Full System 12-1453 Vortex Quiet Insert included and is a USFS Forestry-approved, screen-type, removable Spark arrestor. Thermal dispersement-coated (black) end tip dissipates exhaust heat. Slip fit design prevents cracking exhaust systems by allowing movement between mid-pipe and silencer due to sub-frame movement. Aluminum outlet end cap. Thermal barrier coated silencer housing (black), which keeps heat from melting fenders.