S&S Cycle Diamondback 2-Into-1 Exhaust For Harley Touring Features: Full stainless steel exhaust system with stainless steel header pipe heat shields Oversized stepped header primary tubes for optimal flow and performance Header length helps your M-Eight motor make excellent power 4 OD diameter stainless steel muffler ends before the rear axle Four exhaust bungs for easy O2 sensor installation and air/fuel monitoring Computer aided design & precision bending for improved ground clearance Made in the U.s.a.