Spool Stage 2 IFX350X Upgraded DI Injectors +60% [Gen 2 B58]

Spool Performance Stage 2 IFX350X +60 Upgraded DI Injectors – Gen 2 BMW B58

At some point every B58 owner reaches the same realization: the factory injectors were designed for a polite amount of horsepower… not the kind that requires bigger turbos, ethanol, and questionable life decisions.

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

These injectors are designed for builds that have officially moved past “stage 1 fun” and into “I should probably upgrade the fueling before something expensive happens” territory. With roughly 60% more fueling capability, they give your Gen 2 B58 the headroom it needs for bigger turbos, ethanol blends, and horsepower numbers that make stock injectors start sweating.

Because when your turbo is moving serious air, the last thing you want is your fuel system quietly whispering “I’m doing my best.”

Why Upgrade Your Injectors

More Fuel for More Boost
Factory injectors are great until they suddenly aren’t. These provide significantly increased fueling capacity for serious builds.

Built for High Power B58 Setups
Ideal for larger turbo upgrades, ethanol blends, and high horsepower tuning where stock injectors tap out early.

Maintains Proper Direct Injection Function
Designed to integrate with the B58’s direct injection system while supporting the fueling demands of aggressive builds.

Supports Modern Tuning Platforms
Works with popular BMW tuning solutions used on Gen 2 B58 platforms.

Because Running Out of Fuel Mid-Pull Is Bad for Your Mood
And sometimes your engine.

Key Features

Stage 2 IFX350X upgraded direct injectors
Approximately +60% increased fueling capability
Designed for Gen 2 BMW B58 engines
Supports high horsepower and ethanol blends
Ideal for big turbo and advanced performance builds
Precision engineered for proper fit and performance

Vehicle Compatibility

Designed for BMW Gen 2 B58 engines, commonly found in models such as:

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

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

Octane Garage Note

These injectors will not magically make your car faster by themselves.
They simply remove one of the many excuses your fuel system had for holding you back. Tuning will be needed.