3.0L BMW N55 Stage 2 Bundle

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WHP Potential on Gasoline:
WHP Potential on E85:
Tune Requirement:
Recommended Tuning Suite:
EcuTek, Bootmod3, MHD
HPFP Flow Rate Increase Over Stock:
Stage 2 Injector Flow Rate Increase Over Stock:
Max Operating Pressure:

Expected release date is Nov 3rd 2023


What sets the Nostrum N55 Stage 2 bundle apart:

  • 63% more HPFP flow than stock 
  • Colored pump flange options available 
  • 55% Larger than stock S55 injectors
  • 12% larger than EU5 M5 injectors 
  • Direct Fit, no harness or spacers required
  • OEM decoupling rings pre-installed 


Unlock your N55's true potential with Nostrum's Stage 2 fuel system! Including our ever popular Stage 2 injectors and our Big Bore HPFP, this fuel system is designed to give your N55 as much fuel as it could ever need - without having to rely on meth or port injection! From mild stock turbo daily drivers to fully built record breakers, you can count on Nostrum to keep you fueling good!

The Stage 2 injectors have been designed and tested to flow an incredible 55% more fuel than the stock S55 injectors, and 12% more fuel than the EU5 M5 injectors. That additional fuel flow allows for a significant increase in horsepower, with proper tuning. We estimate that these injectors will flow enough fuel to make over 900 wheel horsepower, and have already fueled plenty of vehicles making north of 700 wheel horsepower!

Take help you take full advantage of your Nostrum Stage 2 injectors, we paired them with our Big Bore HPFP, which flows an incredible 63% more fuel than the stock pump! That additional fuel flow allows for significant torque increases earlier in the rev range, and provide the injectors with all the fuel they need to make more peak horsepower, when properly tuned. It also saves you money versus buying these parts individually!

Inside the box, you will find everything you need to get your new fuel system installed quickly, including pre-installed decoupling rings and detailed installation instructions. When you are ready to tune, we have injector tuning data available for your dealer or tuner. Being that everything is installed like a factory part, there’s no need to worry about secondary injection controllers, filling meth tanks, clogged meth injectors, or any of the other complex solutions people use to squeeze more power out of these vehicles. Additionally, these injectors are operating with all the OEM ECU’s engine management system diagnostics and safety functions – resulting in a much happier and responsive system!  

Every Nostrum manufactured part is backed by a limited lifetime warranty. Our products are comprehensive solutions that come complete with everything you need inside the box, including detailed installation instructions. Tuning guides are also available for your dealer or tuner. We have customer service and calibration engineers on staff to provide you with any support that you may need, from installation to tuning.


Key Differentiating Features:

  • Fully stainless welded construction on the HPFP (zero chance of leakage)
  • Injectors are a direct replacement - no adapters needed!  
  • OEM equivalent spray pattern 
  • Installation guide provided 
  • Tuning Guides available (dealers and tuners) 
  • Limited Lifetime warranty 
  • OEM SAE quick connect fitting (low EVAP) 

Vehicle application list: 

  • 2011–2015 F30/F31 335i
  • 2013–2016 F32/F33/F36 435i
  • 2013–2016 F22/F23 M235i
  • 2015–2016 F20/F21 M135i LCI
  • 2012–2015 F20/F21 M135i
  • 2016–2018 F87 M2 (Non-Competition)
  • 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
Recommended tuners: 


Frequently Asked Questions:

Q: What is the difference between the Stages (for injectors and bundles)? What happened to Stage 1?

A: The specifications depend on the engine application. Usually the Stage 1 bundles are focused for stock-turbo FBO E85 builds and Stage 2 are focused on big turbo/built builds. In some cases we even expand to Stage 3 depending on the capability of the platform, such as the Ford 3.0L EcoBoost and the BMW S55 platforms. The reason we offer stages is to satisfy multiple customer profiles, where the Stage 1 is offering more value and the Stage 2 is offering higher performance capability. This strategy is more customer centric then a one size fits all solution and we have seen very good success in all our other platforms. 

The BMW Stage 1 kits were discontinued as the Stage 2 injectors were far more popular and offered much better performance gains than the Stage 1's could provide.

Q: Why do your numbers say I will make less horsepower on E85 than 93 octane? 

A: Great question! The numbers we list in the product descriptions are similar to the numbers a turbo charger lists for air flow. The numbers are the "fuel system capacity to generate power" regardless of the other engine system limitations (air handling, mechanical limitations, knock propensity). Essentially the numbers are calculated assuming "sufficiently large air flow", "sufficiently capable mechanical assemblies" and disregarding knock limits. The equation uses actual observed engine volumetric efficiency (when available from sponsorship vehicles) and fuel capacity (including target pressures) to calculate power. Gasoline has more energy per mass volume than E85. So the higher fuel flow capacity will mathematically generate higher power potential for a gasoline than a high ethanol content fuel. The other variables (air flow, spark, rotating assembly strength, charge cooling, mechanical assembly strength) are highly variable from build to build. This is why we state horsepower capacity for the fuel system – representing the potential of the fuel system if you have all the other aspects of your build addressed!  

Q: Can you make N54 injectors or pumps?

A: Unfortunately the N54 di injector is a piezo-electric outwardly opening injector. This is a significantly different injector design than the very common solenoid activated multi-hole injector. We have tried in the past to work on these injectors but the crystals tend to crack, rendering the injector useless. So unfortunately we were not able to modify them or make a high performance replacement at this time.  

Q: Why is spray pattern important?

A: While increasing flow rate is critical to making more horsepower, there are other factors to consider when choosing fuel system upgrades. A bigger injector isn’t always a better injector! It can flow a large volume of fuel at WOT, but if the spray pattern is poor, you can expect poor idle quality, poor drivability, increased knock propensity, soot, NVH (noise vibration harshness,) and tuning difficulty. Additionally, the wrong spray pattern can result in liquid fuel impinging in the cylinder walls, causing oil dilution, which increases mechanical wear to internal engine components.

Nostrum has invested significant time and resources into acquiring the equipment and machinery necessary to deliver an OEM level of quality on our injectors. Our spray patternation and arc flash machines (images below) give us an unparalleled look at how an OEM injector is designed and how it operates.  Our engineers design and develop injectors to optimally interact with engine air flow inside the combustion chamber to improve fuel evaporation and create a homogenous air-fuel mixture that results in a higher combustion quality. For you, this means that you can expect our injectors to perform at their absolute best regardless of what you are asking from them, from daily driver duty to setting new ¼ mile records.

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