Fuel-It! Stage 3 LPFP Kit - BMW G-Chassis B58 & S58 (M2/M3/M4/X3M/X4M)

OVERVIEW

The Fuel-It! Stage 3 LPFP Kit adds a high-flow Walbro secondary in-tank pump to the G-Chassis B58 and S58 fuel system for serious high-ethanol horsepower — roughly 900 whp with the Walbro 450 or up to ~1100 whp with the Walbro 525. It's a DIY kit most owners can install at home in under an hour, and it's the in-tank fueling solution for the S58 M2/M3/M4/X3M/X4M as well as the G-chassis B58 cars.

SPECS

• Adds a Walbro 450 (~900 whp) or Walbro 525 (~1100 whp) high-flow secondary in-tank pump
• Covers both G-Chassis B58 and S58 platforms
• Includes fuel filter, mounting brackets, fittings, and wiring
• DIY install — most owners fit it at home in under an hour
• The secondary pump is triggered by a controller (Fuel-It CANfuel, ReFlex, or JB4PRO) or a boost-activated Hobbs switch
• For off-road / competition fueling on high-ethanol blends

PARTS INCLUDED

• Walbro secondary pump (450 or 525 per selection)
• Fuel filter, mounting brackets, and fittings
• Wiring for the secondary pump

TECH RESOURCES

• Secondary pump requires a trigger — pair with our Fuel-It! CANfuel Controller or use a boost-activated Hobbs switch
• Run E85 with our Fuel-It! Flex Fuel Kit — B58 / S58
• Requires a supporting tune — MHD (B58) / MHD (S58)

VEHICLE APPLICATIONS