Stepped headers merge into a true reverse-cone megaphone muffler 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 Heat shields and mounting hardware included Made in the U.S.A. Not for use w/ S&S 111 motors. EXHAUST RR2-1 EVO FXR CH