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

Parts

Spool IFX350-X Stage 2 Upgraded DI Injectors (+60%) - Gen 2 B58 BMW

Spool IFX350 Stage 1 Upgraded DI Injectors (+30%) - Gen 2 B58 BMW

Spool IFX150 Upgraded DI Injectors - Gen 1 B58

Spool FX-350 Upgraded High Pressure Fuel Pumps - BMW S58

Spool FX-350 Upgraded High Pressure Fuel Pump - GR Supra A90/A91

Spool FX-350 Upgraded High Pressure Fuel Pump - Gen 2 B58 BMW

Spool FX-200 Upgraded High Pressure Fuel Pump - Gen 1 B58

Spool FX-350 Upgraded High Pressure Fuel Pump - Gen 1 B58

Wagner Tuning Toyota BMW B58 Fuel Rail (w/o Fittings)

Wagner Tuning BMW B58 Fuel Rail Fitting Kit (Fittings Only)

Wagner Tuning BMW B58 Fuel Rail Kit w/ Fitting

VTT Plug and Play S58 Single HPFP Conversion Kit

PFS S58 Port Injection Block-Off Kit

PFS S58 Port Injection Kit

PFS Drop-In Brushless LPFP Upgrade - S58 G8X / F97 / F98

VTT Billet B58/S58 HPFP Block-Off Plates

PFS Upgraded LPFP Line - GR Supra (A90/A91)

PFS B58 Port Injection Kit

PFS Drop-In Brushless LPFP Upgrade - GR Supra / G-Series BMW

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

DeatschWerks Triple DW420 Module + PTFE Return Kit - Supra A90, BMW M3/M4, X3

DeatschWerks Fuel Pump Module w/ Triple DW420 - Toyota Supra A90/A91, BMW M3/M4

DeatschWerks Fuel Pump Module w/ Dual DW420 - Toyota Supra A90/A91, BMW M3/M4

DeatschWerks Fuel Pump Module, Dual DW420 + PTFE Return - Supra A90, BMW M3/M4