These Dresser Duals by Vance & Hines are a significant upgrade to your stock Harley-Davidson in appearance, and sound. The 2-1/8' 220° full coverage heat shield keeps your chrome from turning blue, while the 1-3/4' head pipes provide the boosted performance and throaty sound. These chrome Dresser Duals are made in the USA, and can be paired with any Vance & Hines or stock slip-on mufflers (which are sold separately). You can also order them in black 541-415 for a totally different look. Chrome Dresser Duals are ported for O2 oxygen sensors, and pre-2007 Harley-Davidson models will also need O2 oxygen sensor plugs, which can be purchased separately 443-405. Vance & Hines does not ship metal exhaust port gaskets with the Chrome Dresser Duals, but may be purchased separately 4400281. Purchase of the Vance & Hines Fuelpak (or Fuelpak FP3 for 2007 and later models) Fuel Management System is highly recommended when installing on motors with electronic fuel injection. Expect head-turning appearance, plus a noticeable improvement in performance and sound quality with these Dresser Duals from Vance & Hines. The 2-1/8" 220° full coverage heat shield is a barrier to blue-proof your pipes, while improved sound and performance come from the 1-3/4" head pipes. Easily compatible with any Vance & Hines or stock slip-on mufflers (which are sold separately). Made with pride in the USA.� Available in chrome, or black 541-415. Chrome Dresser Duals are ported for O2 oxygen sensors. Pre-2007 Harley-Davidson models will also need O2 oxygen sensor plugs, which can be ordered separately 443-405. Metal exhaust port gaskets are not shipped with these Dresser Duals, and must be purchased separately 4400281. Purchase of the Vance & Hines Fuelpak (or Fuelpak FP3 for 2007 and later models) Fuel Management System is recommended by Vance & Hines when installing their Dresser Duals on engines with electronic fuel injection (EFI).