BMW S55 Wireless Ethanol Analyzer Kit - Spool Performance SPX-3B33-4H44-000

  The Spool Wireless Ethanol Analyzer Kit is an affordable and reliable solution for monitoring ethanol content and fuel temperature in your vehicle. Paired with a GM ethanol sensor and our free smartphone app, this system provides...

BMW S55 FX-170 Upgraded High Pressure Fuel Pump - Spool Performance SP-FX-S55-AE

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,...

BMW S55 Stage 3 Low Pressure Fuel Pump - Spool Performance SP-BMF8x-FP

Spool Performance is proud to present the production version of our Stage 3 LPFP (Low-Pressure Fuel System) for the BMW F8x M3/M4 platform. With the use of high-pressure pumps now being able to support DI fueling, we have found the low-pressure electric...