Your fuel injected American V-Twin is equipped with an ECU (electronic control unit) that's programmed to deliver fuel to the motor based on an air/fuel ratio for a stock air filter and stock exhaust system...

NEW Power Commander V General Features for Harley Davidson: Fuel and Timing control Rev Xtend Warm Up fuel adjustment (unit reads engine temp and allows fuel/timing adjustments based on it). Previously the PCIIIusb allowed you to add extra fuel during startup based on number of revolutions of the engine...

THIS FUEL PROCESSOR FITS HARLEY DAVIDSON MODELS: 2002-2007 V-ROD.NOTE: THESE ARE C.A.R.B APPROVED AND CAN BE USED IN CALIFORNIA. Cobra FI2000R Plug-In Fuel Processor for Harley Davidson Proven Fi2000R comes with leads that snap directly into the bikes injector bodies Open-loop design; 06 Dyna and all 07-08 models can use exhaust systems that do or do not have O2 sensor bungs More advanced tuning for modified bikes Think of third tuning pot as an electronic main jet while thinking of the entire Fi2000R as a digital jet kit Full range of fuel adjustment (0-10 settings) across all rpm ranges Three easy identifiable lights: green - Fi2000 is adding more fuel to the air/fuel ratio approx...