FITS ALL OEM MIDS AND FORWARDS 4” ROLLED CONE MUFFLER WITH A 2 ¼ COILED PERFORATED BAFFLE FOR INCREASED TORQUE AND A DEEP TONE 065 STAINLESS STEEL HEADERS STEPPED FROM 1 ¾” TO 1 7/8” TO 2” AT THE COLLECTOR. HAND TIG WELDED FROM TOP TO BOTTOM MACHINED STAINLESS STEEL HEADER COLLARS 18MM O2 BUNGS WITH 12MM ADAPTERS, ALLOWS FOR STOCK OR AUTOTUNE SENSORS COMPLETE HARDWARE KIT WITH EVERYTHING YOU NEED TO MOUNT IT UP