Vance & Hines Fuelpak - Original for 49 State Use 61003A Available in original version which is not legal for sale in CA or new California A.R.B approved version with all the same features as the original Throttle position sensor-based system simplifies the process of fuel-injection tuning Enables you to fine-tune the fuel mixture throughout the entire rpm range with the touch of a button Increases power and improves throttle response Very user friendly; plugs into the existing harness on the bike