Stepped headers merge into a 3-1/2 short straight muffler body with Hot Rod turnout end cap1-3/4 head pipe steps to 1-7/8 into the collector to increase flow and improve performanceRemovable spiral-core louvered baffle includedHand MIG welding18mm and 12mm O2 ports with adapters and plugsIncludes mounting hardwareFull heat shields includedMade in the U.S.A.