Vance & Hines 21+ Harley Davidson Touring / Softail FP4

The Vance & Hines FP4 brings our legendary fuel tuning and performance to your 2007-2023 Harley-Davidson motorcycles, with all new features, and the ease of use you expect from Vance & Hines. With its state-of-the-art Bluetooth enabled app-driven technology, FP4 empowers you to do 100% of your tuning right from the palm of your hand with your mobile device, backed by industry-leading customer support, all while maintaining 49-state emissions compliance and thereby keeping your Harley-Davidson factory warranty intact.