Stage 3 LPFP S58 Low-Pressure Fuel Pump

The Spool Performance Stage 3 Low-Pressure Fuel Pump (LPFP) is engineered as a twin-pump in-tank upgrade for the S58 engine platform. It integrates a secondary pump that activates under boost, ensuring the high-pressure fuel pump (HPFP) is never starved, even with E85 and high boost levels. This system effectively doubles the low-pressure flow capacity, supporting builds up to 1,200+ wheel horsepower and preventing rail pressure drops at high RPMs. The Stage 3 LPFP is designed to be a complete drop-in assembly, simplifying installation. It operates with the factory pump during normal cruising for quiet operation and only engages the secondary pump when boost is applied. This configuration is crucial for high-output calibrations where fuel supply is often the limiting factor before airflow. Fitment is confirmed for the S58 engine across various BMW chassis including the G80/G81 M3, G82/G83 M4, G87 M2, F97 X3 M, and F98 X4 M. It is recommended to confirm your specific chassis using the vehicle selector.