BMW S58 Spool FX-350 Upgraded High Pressure Fuel Pump Kit

The Spool FX-350 high pressure fuel pump kit for the BMW S58 delivers about 50% more fuel than the OEM pumps at up to 390 bar, giving big-power DI builds the fueling headroom they need.

Why you need it

The stock high pressure pumps become the limit fast once you add power or ethanol. The FX-350 uses stainless steel construction with a high-tolerance DLC-coated piston and bore, is built around the S58's dual-pump layout and is E85 compatible as standard. Paired with Spool IFX350 Gen2 DI injectors, it covers the high pressure side for DI-only big power.

Fits

• BMW M2 (G87)
• BMW M3 (G80)
• BMW M4 (G82)
• BMW X3M (F97)
• BMW X4M (F98)
• Alpina B3 (G20)

What's included

• 2 x FX-350 high pressure fuel pumps
• 2 x custom mounting brackets
• Pump alignment tool
• Triple-layer low pressure line
• Plug and play HPFP adapter harness
• Plug and play HPFP hardline
• Spool 10-micron filter unit (if selected)
• Spool wireless ethanol analyzer kit (if selected)

Good to know

Choose at checkout whether to add the wireless ethanol analyzer, use the Spool analyzer you already have, or skip it, and whether to add the 10-micron filter unit. An upgraded low pressure fuel pump is recommended so the FX-350 runs in its optimal range and avoids cavitation damage. A supporting tune is required. Professional installation is recommended.