2 1/8” 220° full coverage heat shields make this a blue proof system, proprietary bends and 1 3/4” head pipes give the sound and performance you want. Add a pair of Vance & Hines slip-on mufflers, to build up one of the best-looking, best-performing exhaust systems available. Vance & Hines quality is built in from the start to make Dresser Duals the head pipe of choice to run with any Vance & Hines or stock slip-on muffler.