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

The Spool IFX350 Stage 1 upgraded DI injectors for the BMW Gen 2 B58 add 30% more flow at high load while keeping idle and part throttle like stock.

Why you need it

As boost and ethanol content go up, the factory direct injectors run out of flow. The IFX350 is sized for the Gen 2 B58 so it behaves like the stock injector at idle and low load, then flows 30% more at high load and high rpm. It is rated to flow at up to 390 bar and was developed over months on Spool's test cars.

Fits

• BMW Gen 2 B58 engines, including the M340i and M440i

Features

• 30% more flow than stock DI injectors
• Flows at up to 390 bar
• Stock-like idle and low-load behavior
• Pairs with Spool FX350 high pressure fuel pumps

Good to know

A supporting tune is required to run these injectors. Spool provides calibration support for the existing Gen 2 B58 tuning platforms. Professional installation is recommended.