A90 / A91 Toyota Supra B58 Gen 2 Stage 3 FX-350 Upgraded High Pressure Fuel Pump

At some point in every B58 build there’s a moment of honesty.
The turbo is bigger. The ethanol content is higher. The boost number in your tune file is… optimistic.

And suddenly the factory injectors are doing the mechanical equivalent of sweating nervously and asking HR if overtime is optional.

That’s where the Spool Stage 2 IFX350X +60 DI Injectors step in.

These are designed for builds that have officially progressed past “stage 2 fun” and into “I should probably make sure the engine actually has enough fuel for this” territory. With roughly 60% more fueling capacity, these injectors give your Gen 2 B58 the headroom needed for ethanol blends, big turbo setups, and horsepower numbers that make stock injectors quietly reconsider their life choices.

Because when your turbo is shoving a hurricane of air into the engine, the fuel system should probably show up to work too.

Why Upgrade Your Injectors

+60% More Fueling Capacity
When stock injectors reach their limit, these provide the additional fueling needed for high power B58 builds.

Designed for Serious B58 Builds
Perfect for larger turbo upgrades, aggressive tuning, and ethanol blends where factory fueling simply taps out.

Maintains Direct Injection Efficiency
Engineered to integrate with the B58’s direct injection system while supporting significantly higher power levels.

Built for Modern BMW Tuning Platforms
Compatible with common tuning setups used on Gen 2 B58 engines.

Because Running Out of Fuel at 6,500 RPM Is a Bad Time
And often an expensive one.

Key Features

Stage 2 IFX350X upgraded direct injectors
Approximately +60% increased fueling capacity
Designed specifically for Gen 2 BMW B58 engines
Supports ethanol blends and high horsepower builds
Ideal for big turbo and high boost setups
Precision engineered for performance and reliability

Vehicle Compatibility

Designed for Gen 2 BMW B58 engines, including many models such as:

BMW M340i
BMW M440i
BMW Z4 M40i
Toyota GR Supra (B58)
BMW X3 M40i / X4 M40i
and other Gen 2 B58 applications

(Always verify fitment and tuning requirements for your specific vehicle.)

Octane Garage Note

These injectors won’t magically make your car faster by themselves.

They simply remove one of the many reasons your fuel system had for holding your turbo back.