3.0L BMW S55-N55 Stage 2 DI Injectors

🚀 Nostrum Stage 2 Fuel Injectors – BMW N55 / S55 Engines

Over 900 WHP Potential — No Secondary Injection Required

🧬 Industry-Leading Fuel System Engineering

The Nostrum Stage 2 Injector Kit is a direct-fit, OEM-quality upgrade for BMW N55 and S55 engines. Flowing 55% more fuel than stock S55 injectors and 12% more than the EU5 M5, these injectors unlock significant horsepower gains—capable of fueling over 900 WHP with proper tuning.

These are not just bigger injectors—they're engineered from the ground up for superior spray pattern, drivability, and long-term reliability. Whether you're daily driving, track racing, or chasing dyno numbers, Nostrum injectors deliver OEM-level integration and record-setting performance without the need for port injection or meth systems.

✅ What’s Included:

• Set of six tested and flow-matched injectors

• OEM decoupling rings pre-installed

• Static and dynamic quality-tested (700+ data points per injector)

• Installation guide + QuickStart manual

• Injector serial number data card

🔧 Features & Benefits:

• Direct fit – No harnesses, spacers, or adapters required

• Plug-and-play with OEM ECU diagnostics and safety functions

• Ethanol compatible

• OEM-equivalent 6-hole spray pattern

• Compatible with all major tuning platforms (MHD, BM3, etc.)

• Expertly validated Bootmod3 dropdown support by Nostrum

• Limited lifetime warranty

• Install-ready – No need to fill meth tanks or manage additional systems

💡 Why Spray Pattern Matters:

More fuel is critical for horsepower, but precision matters just as much. Poor spray can cause:

• Knock

• Poor idle and throttle response

• Oil dilution

• Excessive carbon and soot buildup

• Increased engine wear

Nostrum injectors are developed using OEM-grade spray patternation and arc flash diagnostics. Every batch is validated for optimal atomization and targeting, ensuring smooth combustion and reliable power delivery under all driving conditions.

📊 Performance Highlights:

• 700+ WHP validated in real-world applications

• Over 900 WHP potential with proper tuning and supporting mods

• No secondary port or meth injection required

Example Dyno:

📈 578 WHP / 620 WTQ on full E85 – single injector set with no port/meth injection

🧰 Upgrade Further with Nostrum Bundles:

S55 Stage 2 Bundle:

• Adds high-pressure fuel pumps flowing 36% more than stock

• Increases low-end torque and top-end fuel delivery

N55 Big Bore Bundle:

• Upgraded HPFP with 63% more fuel flow

🧪 Quality Control & Testing:

• Every injector undergoes 700+ individual QC checks

• Batch flow matched to within ±5% across 5 test points

• Validated to operate at OEM pressures and beyond

• Backed by Nostrum’s limited lifetime warranty

📦 Vehicle Fitment:

• BMW F80 M3 / F82-F83 M4

• BMW F87 M2 Competition / CS

• 2013–2015 F30/F31 335i

• 2013–2016 F32/F33/F36 435i

• 2013–2016 F22/F23 M235i

• 2012–2016 F20/F21 M135i (Pre & Post LCI)

• 2016–2018 F87 M2 (Non-Comp)

• 2013–2017 F10/F11/F07 535i

• 2013–2017 F25/F26 X3/X4 35i

• 2014–2019 F15/F16 X5/X6 35i

• 2013–2018 F06/F12/F13 640i

• 2013–2015 F01 740i / Li

🧠 Frequently Asked Questions:

Q: Do these injectors work on the S63?
✅ Yes — sets of 8 are available separately.

Q: Do these require coding?
⚠️ Recommended for best idle and drivability. Use ISTA+, Autel MaxiSys, or ANSEL BM700.

Q: Do they really flow more than EU5 M5 injectors?
✅ Yes — 12% more with OEM spray pattern and correct targeting.

Q: What about durability and consistency?
✅ Every injector is tested and matched at five flow rates. Spray pattern is within 3% of OEM cone angle and bend, ensuring true OEM-level performance and no guesswork for tuners.

🔧 Recommended Tuners:

• Bend Calibration

• David Shoup

• Paul Johnson Tuning

• HCPerformance Tuning

• Cary Jordan

🛡️ Buy with Confidence:

Nostrum parts are designed, tested, and assembled in-house with OEM-level engineering and validation. If you're building for the street, track, or dyno glory, this is the last injector upgrade you'll need.