The BoosterPlug is the smarter choice, when you want to improve the rideability on your Harley Davidson Road King Special FLHRXS without spending a fortune.
Compared to the Power Commander, the BoosterPlug offers similar or better results for must owners - at a much lower price and without the complicated setup.
Installation couldn't be easier - The BoosterPlug comes with the correct connectors to let you plug it in to the bikes wire harnes. No programming required.
There is no better way to improve your riding experience:
- Much better and softer throttle response
- Better acceleration
- Remove the low speed surging
- Removes the weak idle and stalling issues
- Far less popping in the exhaust on deceleration
This version of the BoosterPlug covers all versions of the Harley Davidson Road King Special FLHRXS with the Milwaukee 8 engine (2017 and newer).
General Installation Instructions
Bike Specific Installation Instructions