3.0L BMW S55/N55 Stage 2 DI Injectors

Was: $1,599.00
Now: $1,519.99
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WHP Potential on Gasoline:
950 WHP
WHP Potential on E85:
715 WHP
Tune requirement:
Recommended Tuning Suite:
EcuTek, Bootmod3, MHD
Flow Rate Increase Over Stock:
Max Operating Pressure:
250bar / 25MPa / 3625psi

Expected release date is Nov 25th 2022


Introducing Nostrum Stage 2 N55/S55 Injectors! These are the largest injectors currently available on the market. They 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 when compared to stock. 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 more than 700 wheel horsepower vehicles -  without the need for secondary port or meth injection!  

Inside the box, you will find everything you need to get your new injectors installed quickly, including pre-installed decoupling rings and detailed installation instructions for a high quality install. 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!  

Take full advantage of your Nostrum Stage 2 injectors by pairing them with our HPFP upgrade kit, flowing an incredible 36% more fuel than the stock pumps! 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. Get the best deal by bundling up! 

 These products come complete with everything you need inside the box, including detailed install instructions. Nostrum back all of our parts with a lifetime warranty. 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 install to tuning. 

Application List:

  • BMW F82/F83 M4 
  • BMW F80 M 
  • BMW F87 M2 Competition/CS 
  • 2011–2015 F30/F31 335i 
  • 2013–2016 F32/F33/F36 435i 
  • 2013–2015 F30 ActiveHybrid 3 
  • 2013–2016 F22/F23 M235i 
  • 2015–2016 F20/F21 M135i LCI 
  • 2012–2015 F20/F21 M135i 
  • 2016–2018 F87 M2 (Non-Competition) 
  • 2013 E8X - 135i 
  • 2013-2017 F10/F11/F07 535i 
  • 2013-2017 F25/F26 X3/X4 35i 
  • 2014-2019 F15/F16 X5/X6 35i 
  • 2013 E9X - 335i 
  • 2013+ E84 - X1 35i 
  • 2013+ E70/E71 X5/X6 35i 
  • 2013-2018 F06/F12/F13 640i 
  • 2013-2015 F01 740i/Li  




Q: Will these work on the S63? 

A: Although the injectors are of the same injector outline as the S/N63 engine platform, Nostrum has not validated these injectors in an S63 or N63. Thus, we don’t offer installation or tuning guides and we can’t offer customer service for those engine platforms. Additionally, this product is batched in sets of 6, not sets of 8. 

Q: Do these require coding? 

A: To achieve the best performance from your Nostrum injectors we recommend coding them. Coding injectors will improve idle quality by removing compensations specific to your old injectors, which allows you to take full advantage of Nostrum’s batching process for a complete high quality driving experience. 

Q: What software can I use to code my injectors? 

A: You can code the injectors using BMW ISTA+, Autel MaxiSys service tools, ANSEL BM700, and potentially other service tools – Not validated by Nostrum 

Q: Do these flow more than the EU5 M5? 

A: The flow rate of these injectors is 12% higher than EU5 M5 injectors when compared to stock, and have the OEM equivalent spray pattern with the proper spray orientation for the S/N55 combustion system. 

Q: People say  the “spray pattern is bad and the flows are no good”.  

A: Every injector is production tested in our GDI machine and has more than 700 data points including multiple leak tests, multiple static flow rates, multiple dynamic flow rates, maximum operating pressure, maximum flow rate, opening & closing time, continuity, and resistance. This assures the individual injector quality.  

Every batch of 6 injectors is flow matched at 5 different data points to be sure the set is well within the +/-5% to set nominal flow rate. This assures the set flow performs with specification  

The spray pattern for stage 2 is an OEM equivalent spray pattern. The 6 hole spray targeted spray pattern is within 3% of the OEM cone angle and bend angle. This is validated on our HexCell spray patternation asset (see image)

High-load long duration engines failures have occurred on systems employing dual port meth injection to make-up the fueling for 800+ whp builds. For builds of that size, we recommend our stage 3 injectors as opposed to meth injection.  

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