Stepped headers merge into a 3-1/2 short straight muffler body with Hot Rod turnout end cap 1-3/4 head pipe steps to 1-7/8 into the collector to increase flow and improve performance Removable spiral-core louvered baffle included Hand MIG welding 18mm and 12mm O2 ports with adapters and plugs Includes mounting hardware Full heat shields included Made in the U.S.A.. EXHAUST 2:1 HOTRD C 95-06