The V&H Fuelpak controls the fuel of your Harley Davidson using a throttle position sensor-based system that greatly simplifies the process of fuel-injection tuning. This module enables you to fine-tune the fuel mixture throughout the entire rpm range with just the touch of a button and it will increase power and improve the throttle response after a pipe and air cleaner upgrade. The Vance and Hines FuelPak is user friendly and simply plugs into the existing harness on the bike, no computer or software is required and you simply punch in the values supplied with the Fuelpak to get up and running. Fuelpak will work with all exhaust systems but the supplied values are for Vance and Hines pipes. The FuelPak includes all necessary mounting hardware and also has a CARB approved version. Check it out.