Wide band O2 sensors are 18mm and the stock O2 sensors in your bike are 12mm so if your exhaust doesn't have the 18mm O2 bungs you would have to weld in 18mm O2 bungs. Some aftermarket exhaust systems have both the 12mm and 18mm O2 bungs so check and see what you have. I all reality the narrow band 12mm O2 sensors will work just fine for the mods you have.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.