Stepped headers merge into a true reverse-cone megaphone muffler 1-3/4" headpipe steps up to 1-7/8" into a collector to increase flow and improve performance 4" muffler body with billet end cap Removable spiral-core louvered baffle included Heat shields and mounting hardware included 24" muffler length 12 mm and 18 mm O2 sensor port plugs included Made in the U.S.A.. EXH RR 2-1 BLK 10-16FLT