Spool Stage 3 DIY LPFP — BMW B58 Gen 2 | Built by Boost & Tune

Spool Stage 3 DIY LPFP Kit – BMW B58 Gen 2

$1,771.00

Pump

Activation Harness

Spool Stage 3 DIY LPFP Kit for BMW B58 Gen 2 is a drop-in secondary-pump upgrade for G-chassis BMW B58 applications, with selectable Walbro pump and activation-harness configurations.

Walbro 450 or Walbro 525 secondary-pump choice
Three supplier-listed activation harness choices for Hobbs-switch or ReFlex-controlled builds
Three-piece bracket system designed to secure the pump without cutting the factory fuel bucket
Supplied hose and fittings tee into the factory fuel line
Walbro 450 is the supplier-recommended choice for most applications
Walbro 525 is intended for higher fuel-flow requirements; Spool recommends PWM control because of its higher current draw

Fitment: Spool states the kit supports G-chassis BMW B58 vehicles. Vehicle year, model or VIN should be supplied when ordering because BMW uses multiple fuel-tank bracket designs.

Optional items: Spool lists a pre-drilled OEM top hat and Holley Hydramat separately; they are not automatic variants in this Built by Boost & Tune listing.

Dispatch: Special order — allow 2–3 weeks.

Product System

Fuel System

Vehicle Fitment

BMW 2 Series M240I G42 B58
BMW 340I M340I G20 G21 B58
BMW 4 Series G22 B58
BMW 4 Series G23 B58
BMW 4 Series Gran Coupe G26 B58
BMW 5 Series G30 B58
BMW 5 Series Touring G31 B58
BMW X3 G01 B58
BMW X4 G02 B58
BMW X5 G05 B58
BMW X6 G06 B58
BMW X7 G07 B58
BMW Z4 G29 B58

Confirm chassis, engine, drivetrain and production-year compatibility before ordering.

Available Options

Pump

Walbro 450 (Recommended)
Walbro 525

Activation Harness

Ground Activation / ReFlex Flying Lead
Ground + Power Activation / ReFlex Plug N Play / Rev2 BM3
Spool Hobbs Switch

Supplier Part Numbers

SP-BMB58G-LPFP-DY-450-FLY, SP-BMB58G-LPFP-DY-450-PNP, SP-BMB58G-LPFP-DY-450-HOBBS, SP-BMB58G-LPFP-DY-525-FLY, SP-BMB58G-LPFP-DY-525-PNP, SP-BMB58G-LPFP-DY-525-HOBBS