aFe 49-42016 Mach Force XP Exhaust System 5-inch mandrel bent 409 stainless steel tube for maximum flow High flow muffler Lower EGT's Bayonet style hangers for easy installation OE-style bayonet hangers are used to maintain a stable pipe location during high vibration and high heat conditions. The bayonet tip holds the hanger bushing in place for an OE-style fit that does not change with time.