The BoosterPlug is accepted world wide, as a brilliant and affordable way to transform your Harley Davidson Road King FLHR from ”OK” to ”Absolutely Marvelous”.
No need to spend a small fortune on complicated devices like the Power Commander + endless Dyno hours, to make your bike run like it should have from the factory.
We designed the BoosterPlug to be easy and fast to install, so it comes with the correct connectors to let you install it without cutting and splicing wires.
A true plug and play solution that will make your bike so much better:
- Much better and softer throttle response
- Quicker acceleration
- No more low speed surging
- Stronger and more reliable Idle
- Reduced popping in your aftermarket exhaust
This version of the BoosterPlug covers all versions of the Harley Davidson Road King FLHR with the Milwaukee 8 engine (2017 and newer).
General Installation Instructions
Bike Specific Installation Instructions