The Vance & Hines Fuelpak FP3 user manual details a process for optimizing Harley-Davidson engine performance by allowing riders to map their ECU via Bluetooth. The document focuses on the Autotune feature, which learns the bike’s specific needs during a ride to improve throttle response and eliminate issues like deceleration popping. Learn more from the Fuelpak FP3 user manual . USER'S MANUAL