Bassani Xhaust 2:1 Exhaust - Black200443504 Product Description Stepped headers merge into a 3 1 2" short straight muffler body with Hot Rod turnout end cap 1 3 4" headpipe steps up to 1 7 8" into the collector to increase flow and improve performance Removable spiral core louvered baffle included Hand MIG welding 18 mm and 12 mm O2 ports with adapters and plugs Includes mounting hardware Full heat shields included Made in the U. S. A.