Spool BMW B58 Gen 1 Auxiliary Split Fuel System
Spool BMW B58 Gen 1 Auxiliary Split Fuel System
Spool BMW B58 Gen 1 Auxiliary Split Fuel System separates the direct-injection and port-injection fuel feeds for more stable, boost-referenced fueling on higher-output BMW B58 builds.
- Dual Walbro 450 pumps supplied as the base configuration
- Optional dual Walbro 525 configuration for higher fuel demand
- OEM fuel-pump top-hat integration using precision-machined fittings
- Plug-and-play ReFlex controller compatibility
- Triple-layer PTFE fuel plumbing with stainless reinforcement
- Compact boost-referenced Spool fuel-pressure regulator
Fitment: BMW B58 Gen 1: F22/F23 M240i, F30/F31/F34 340i and F32/F33/F36 440i applications listed by Spool.
Important: Spool's solid-state PWM relay harness is a separate option. Confirm pump choice, port-injection controller, injector size and base pressure with the tuner.
Dispatch: Special order — allow 3–4 weeks.
Supplier
Spool Performance
Product System
- Fuel System
Vehicle Fitment
- BMW 2 Series F22 Lci B58
- BMW 2 Series F23 Lci B58
- BMW 3 Series F30 Lci B58
- BMW 3 Series F31 Lci B58
- BMW 3 Series Gt F34 B58
- BMW 4 Series F32 Lci B58
- BMW 4 Series F33 Lci B58
- BMW 4 Series Gran Coupe F36 Lci B58
Confirm chassis, engine, drivetrain and production-year compatibility before ordering.
Available Options
Pump Option
- Walbro 450 with check valves
- Walbro 525 with check valves
Supplier Part Numbers
SP-B58G1AUXF450, SP-B58G1AUXF525
Built by Boost & Tune Support
BBT can assist with fitment review, installation, supporting modifications, configuration and calibration requirements where applicable.