Will 08-09 Hammer swept exhaust work on a 05 Hammer? I heard the only difference is an o2 sensor.

Pipes will bolt on, and you just have to plug the o2 bungs. The filter, cover, and map that comes with them would do you no good though.

Would I still have to recalibrate the fuel injection? I currently have stage 1 slip ons.

Would I still have to recalibrate the fuel injection? I currently have stage 1 slip ons.

Prolly get away with just a TPS adjustment