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 baffle is packed for throaty sound and increased low-end torque 4" muffler body with billet end cap Includes heat shields, mounting hardware, and O2 sensor port plugs Sold as a complete exhaust system Made in the U.S.A.