• The Black 2-Into-2 Big Radius Exhaust Pipes by Vance & Hines will give your Harley-Davidson Dyna the style and sound sure to turn heads• Manufactured using 16-gauge steel, the 1-3/4" diameter chrome pipes are fully covered in matte black finish heat shields featuring a contrasting chrome end treatment and the Vance & Hines badge• The dyno-tuned, radius-covered louvered baffles are responsible for producing the rich, deep sound Harley riders expect of aftermarket exhaust systems• The 12mm O2 oxygen sensor is now positioned deeper into the exhaust system, providing improved feedback to the ECM• Pre-2007 Harley-Davidson models will need O2 oxygen sensor plugs, which may be purchased separately 443-405• Vance & Hines Big Radius 2-Into-2 Black Exhaust Pipes are made in the USA• Purchase of the Vance & Hines Fuelpak or Fuelpak FP3 (for 2007 and later models) Fuel Management System is recommended when installing Big Radius Exhaust Pipes on motorcycles with EFI• Vance & Hines does not ship metal exhaust port gaskets with the Big Radius Exhaust Pipes. Metal exhaust gaskets may be purchased separately 4400281