Feature stepped headers that start at 1-3/4" headpipe steps up to 1-7/8" into the collector to increase flow and improve performance Billet end cap and removable baffle is packed for throaty sound and increased low-end torque 16-gauge steel headpipe, muffler and heat shield for strength O2 ports and plugs included Made in the U.S.A.. EXHST RR2-1 SH 86-11ST CH