Do I need an HPFP upgrade for my B58?

Only if you want to run more ethanol or more power than the stock pump can support. On Stage 1 or Stage 2 with pump gas, most cars do not need one. If your logs show fuel pressure dropping on ethanol, it is time.

What does a flex fuel kit do?

It reads the ethanol content of your fuel and sends it to the tune. The tune then adjusts timing and fueling on its own. You can fill with any mix of pump gas and E85 without reflashing. It needs a flex-capable tune.

Do I need to upgrade the low pressure pump too?

Usually yes, once you run higher ethanol blends or port injection. The LPFP feeds the HPFP. If it cannot keep up, the high pressure side will not hold pressure either.

Will a Gen 1 HPFP fit my Gen 2 car or Supra?

No. Gen 1 and Gen 2 B58 engines use different fuel systems. The Gen 2 pumps listed here fit both G-series BMW and the A90/A91 Supra.

Do I need port injection?

Only for big-turbo builds or full E85 at high power. It adds a second set of injectors and needs a controller, an upgraded LPFP and a custom tune. Most owners do the HPFP and LPFP first.

B58 Fuel System Upgrades: HPFP, LPFP, Port Injection and Flex Fuel

MOTIV Re|Flex Lite Standalone Injector Controller

Fuel-It! HPFP Upgrade for Gen1 B58 (Stage 1 LT1 / Stage 2 LT4 based)

Fuel-It! BMW G-Chassis Stage 2 LPFP Upgrade for B48/B58

Fuel-It! BMW F-Chassis Stage 3 LPFP Upgrade for B58 (Walbro 450/525)

Dorch Engineering B58 Gen2 DS25 HPFP + S58 Injector Combo

DeatschWerks 2020+ Toyota Supra (A90) DW440 Brushless 440lph In-Tank Fuel Pump

DeatschWerks A90/91 Supra/G8X BMW M3/M4 Fuel Pump Module w/ Dual DW420 Pumps

DeatschWerks 20-24 A90/91 Toyota Supra/G8X BMW M3/M4 Fuel Pump Module w/Dual

DeatschWerks 20-24 A90/91 Toyota Supra/G8X BMW M3/M4 Fuel Pump Module w/Triple

DeatschWerks A90 Supra/G8X BMW M3/M4 X3 Module w/ Triple DW420 Pumps and PTFE

DeatschWerks A90 Supra/G8X BMW M3/M4 X3 Module without pumps

Gen 2 B58 - Spool FX350 Upgraded HPFP

Snow Performance Stage 3 Boost Cooler (EFI) Water-Methanol Kit

Vader Solutions B58 Stage 3 Low Pressure Fuel Pump for G-Series

Precision Raceworks Stand Alone AFS (M340i/M440i G2x)

Fuel-It! Gen1 & 2 B58 Billet Port Injection Manifold

Fuel-It! CANfuel Sequential Port Fuel Injection Controller (BETA)

Dorch Engineering B58 Gen1 HPFP + Fuel Cam kit

Bosch B58TU OEM High Pressure Fuel Pump (replacement)