Spool Stage 1 IFX350 Upgraded DI Injectors +30% [Gen 2 B58]

Congratulations. Your BMW B58 has reached the point where the factory injectors are waving a little white flag and politely asking you to stop turning the boost up.

These are the Spool Stage 1 IFX350 upgraded direct-injection injectors, designed for people who think “just one more PSI” is a reasonable life philosophy. Instead of your stock injectors running out of fuel and ruining your dyno day, these deliver 30% more flow while still behaving like civilized OEM injectors when you’re just cruising to Starbucks pretending the car is stock.

They’re engineered specifically for Gen 2 BMW B58 engines, meaning you get the fuel you need for higher boost, ethanol blends, and power levels that make the factory calibration engineers nervous.

Basically:
Your turbo gets the fuel it wants.
Your tuner gets the control they want.
And your stock injectors get to retire with dignity.

Real Specs (Not Internet Dyno Numbers)

• +30% fuel flow over stock injectors

• Supports up to ~390 bar fuel pressure

• Designed to retain stock-like idle and low-load drivability

• Optimized for high load / high RPM fueling demands

• Developed and tested on real Gen 2 B58 builds

• Compatible with major Gen 2 B58 tuning platforms (tune required)

• 1-year manufacturer warranty

Ideal For

• Tuned BMW B58 Gen 2 builds

• Big turbo setups

• Ethanol / E blends

• High-boost tuning

• People who keep saying “I’ll stop modding after this”

Compatible Platforms (Gen 2 B58)

• BMW M340i / M440i

• BMW G-series B58TU vehicles

• Toyota A90 / A91 Supra

If your stock injectors are already crying during logs, this is the polite solution before you start doing questionable things with auxiliary fueling.