Spool FX-170 Upgraded High Pressure Fuel Pump Kit [S55]

Spool FX-170 Upgraded High-Pressure Fuel Pump Kit – S55 What is the FX-170? The FX-170 is a high-performance upgraded high-pressure fuel pump (HPFP) designed to push the fueling limits of the S55 engine. Featuring a larger bore than the stock unit, it delivers 50% more flow, making it an ideal upgrade for high-power builds. The FX-170 is fully E85 compatible and plug-and-play, requiring no cutting or splicing for installation. Additionally, it operates at 25% higher pressure than stock, allowing injectors to deliver increased fuel volume for the same opening time. Why Do You Need It? The factory S55 HPFP is a significant bottleneck when tuning for higher horsepower and ethanol blends. The FX-170 eliminates this limitation, increasing fueling headroom for larger turbos, aggressive E85 mixtures, and high-boost applications. With improved flow and higher operating pressure, the FX-170 ensures your fueling system keeps up with performance demands. What’s Included in the Kit? 2x FX-170 Upg