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When you install Vance & Hines Big Radius 2 into 1 Exhaust on your Harley-Davidson Dyna, you'll never be able to sneak up on anybody ever again. Your bike will have the looks and sound that never goes unnoticed. They're manufactured in the USA using 16-gauge steel, and the 1-3/4” diameter chrome pipes are fully covered in matt black finish heat shields, and you'll love the contrasting chrome end with Vance & Hines badge. The awesome sound is produced by the dyno-tuned, radius-covered louvered baffles. The 12mm O2 oxygen sensor is now wisely located deeper into the exhaust system, providing improved feedback to the ECM. Pre-2007 Harley-Davidson bikes will need O2 oxygen sensor plugs, which are purchased separately 443-405. When installing on bikes with electronic fuel injection, purchase of the Vance & Hines Fuelpak (or Fuelpak FP3 for 2007 and later models) Fuel Management System is recommended. Metal exhaust port kets may be purchased separately 4400281.• These handsome Black 2-Into-2 Big Radius Exhaust Pipes by Vance & Hines turn your Dyna into a striking conversation piece that can haul ass.• Manufactured with precision out of 16-gauge steel, the 1-3/4" diameter chrome pipes are fully covered in matte black finish heat shields with contrasting chrome end and the Vance & Hines badge.• The dyno-tuned, radius-covered louvered baffles give you the rich, deep sound Harley riders can't live without.• The 12mm O2 oxygen sensor is located deeper into the exhaust system for improved feedback to the ECM.• Pre-2007 Harley-Davidson models will need O2 oxygen sensor plugs, which can be purchased separately 443-405.• Proudly made in the USA.• Installation of the Vance & Hines Fuelpak (or Fuelpak FP3 for 2007 and later models) Fuel Management System is recommended when using Big Radius Exhaust Pipes on motorcycles with electronic fuel injection.• Metal exhaust port kets must be purchased separately