Vance & Hines Fuelpak FP4 ECU Tuner For Harley Touring / Softail The same team who produced the Fuelpak FP3 that you know and love has doen it again with the Fuelpak Fp4! The Vance and Hines FuelPak FP4 is the most intuitive fuel management tool on the market, it allows you to change your motorcycle's tune, view live sensor data, and clear trouble codes right from your smartphone! The FP4 is able to utilize data from your OEM engine management sensors to create a custom tune just for your bike using the AutoTune feature. For advanced users who want to get more hands on, the FP4 gives you complete access to critical ECU tables so you can see and adjust every aspect of your tune. The FP4 can make changes to your idle Rpm, raise your rev limit, or adjust tables including VE, Target Air Fuel Ratio, and Spark Advance all from an app right on your phone. Features: Vance & Hines offers a vast library of available dyno-tuned maps Smaller and thinner than the previous generation fuel tuner LEDs have been simplified so you know exactly what's going on between the FP4 and your motorcycle Built from the ground up Android and iPhone apps feature a new rider interface and are easier to navigate than previous versions Live Data in the FP4 App has been upgraded with a whole new look, and an additional gauge to track more crucial data while you ride All new Performance Data feature allows you to record your ride, look at all available sensors in the created chart, and see a map of your ride recorded with your phone's onboard GPS Note: The FP4 is intended for Stage 1 applications, maps for Stage 2 and Stage 3 applications may not be available. Contact Vance and Hines for current map availability.