Nostrum - BMW N55-S55 Stage 3 DI injectors

Nostrum Stage 3 Injectors for N55 & S55 — Ultimate High-Flow Fuel Solution

What sets Nostrum Stage 3 Injectors apart?

• 85% larger flow than stock (20.2 g/sec vs 10.9 g/sec)

• 31% larger than EU5 M5 injectors (20.2 g/sec vs 15.4 g/sec)

• 19% larger than Nostrum Stage 2 injectors (20.2 g/sec vs 17.0 g/sec)

• Direct fit — no harnesses or spacers needed

• OEM decoupling rings pre-installed

• Ethanol compatible

• OEM-comparable spray pattern for perfect atomization and drivability

• Comprehensive installation guide included

Ready for 4-Digit Horsepower?

The long-awaited Stage 3 injectors for the N55 and S55 engines have arrived. Flowing an astonishing 85% more fuel than stock while maintaining a robust 250 bar operating pressure, these injectors are engineered for those aiming at serious horsepower goals.

Built to OEM specifications, the Stage 3 injectors deliver an optimal spray pattern that maximizes fuel atomization for superior combustion — all without sacrificing idle quality, drivability, or engine safety.

Because they install like factory parts, you avoid the hassles of secondary injection controllers, methanol injection tanks, clogged meth injectors, or other complicated add-ons that remove layers of engine protection.

Complete Installation Package

Inside the box, you’ll find everything needed for a straightforward install — including pre-installed decoupling rings and step-by-step instructions. When you’re ready to tune, Nostrum offers trusted certified tuners and tuning data for your preferred tuner or dealer.

Pair your Stage 3 injectors with our S55 HPFP upgrade kit, which flows 36% more fuel than stock. This combination delivers improved torque throughout the rev range and supports peak horsepower gains with proper tuning.

Built for Reliability & Support

Every Nostrum product is backed by a limited lifetime warranty. Alongside detailed installation instructions and tuning guides, you get access to expert customer service and calibration engineers to assist from install to tune.

Frequently Asked Questions

Will these fit an S63 engine?
Yes, but they come in sets of 6. For a full set of 8 injectors for the S63, see our S63 Upgraded Injectors.

Why is OEM equivalent spray pattern important?
Fuel flow alone doesn’t guarantee performance. Poor spray patterns cause drivability issues, increased knock, soot, noise, and can damage engine components. Nostrum’s advanced testing and design ensure our injectors deliver ideal spray for excellent combustion and engine health.

Vehicle Applications

• 2015–2018 BMW F82/F83 M4

• 2015–2018 BMW F80 M3

• 2016–2019 BMW F87 M2 Competition/CS

• 2016–2018 BMW F87 M2 (Non-Competition)

• 2013–2016 BMW F32/F33/F36 435i