3.0L BMW S55-N55 Stage 2 DI Injectors

MSRP: $1,799.00
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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:
17.0 g/s @ 100 bar
Flow Rate Increase Over Stock:
Flow Rate Increase Over EU5:
Max Operating Pressure:
250bar / 25MPa / 3625psi

Expected release date is Jun 14th 2024


What sets Nostrum apart:

  • 55% Larger than stock S55
  • 12% larger than EU5 M5 injectors  
  • Direct Fit, no harness or spacers required 
  • OEM decoupling rings pre-installed 
  • Ethanol Compatible 
  • OEM equivalent spray pattern 
  • Every injector is tested statically and dynamically to ensure best quality product and set batching 
  • Includes comprehensive installation guide 
  • Bootmod3 Dropdown – expertly developed and validated by Nostrum 

Introducing Nostrum Stage 2 N55/S55 Injectors!  Our Stage 2 injectors 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 more than 700 wheel horsepower vehicles -  without the need for secondary port or meth injection!  

Have a built engine that you want to push to the absolute limit? The 1000 whp capable Stage 3 injectors are for you!

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 bundling up! The Stage 2 S55 bundle includes our upgraded high pressure fuel pumps, 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. We have a similar Stage 2 bundle for N55 owners, which includes our Big Bore pump that flows 63% more fuel! 

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.

Why is spray pattern important?

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.

What's in the box:

  • Tested and flow matched set of six injectors 
  • Installation and QuickStart guides included 
  • Data Card with serial numbers included 
  • OEM decoupling rings pre-installed 
Vehicle application list: 
  • BMW F82/F83 M4 
  • BMW F80 M 
  • BMW F87 M2 Competition/CS 
  • 2013–2015 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  

Dyno graph sponsorship results:

578 WHP 620 WTQ on E85: 

*Horsepower and Torque numbers are approximate and can vary significantly depending on numerous factors including what supporting upgrades are done to the vehicle, ambient temperature, elevation, road surface, tire selection & condition, fuel octane and quality, vehicle weight, and more.  The advertised numbers herein are based on optimal conditions and utilizing proper supporting modifications.  Your results may vary.

Frequently ask questions:

Q: Will these work on the S63? 

A: Yes, batched sets of 8 injectors for the S63 can be found here: S63 Injectors

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.  

Limited Lifetime Warranty Policy Warranty only covers Nostrum manufactured products. (Distribution products are covered under original manufacturer’s warranty.) This policy is in force for products delivered after 01/01/2021. Warranty explicitly excludes the cost of labor for product installation and removal, diagnostics, or troubleshooting. Warranty does not cover items that have been tampered with, misused, improperly installed, or used in an improper application. Warranty may not apply to shipping damages. Warranty covers manufacturing defects: Damaged upon opening, not including shipping damages Broken connector Terminal loose Damaged or missing O-rings, combustion seals, or spacers Logs, tune files, and diagnostic results will be required before product is returned for the warranty replacement of all of Nostrum’s products. If a Nostrum product is assumed to have failed and sent in for a warranty claim, an inspection and performance test will be performed. If no fault is found there will be a Service Charge of $125.00 applied before the component is returned. Nostrum will replace at no charge any Nostrum product that is deemed under warranty. Warranty is non-transferable and limited to original purchaser for vehicle application. Customer must fill out Nostrum’s Return Material Authorization Form completely including product serial number for return to be accepted. Warranty applies only to items purchased directly through Nostrum High Performance or an authorized Nostrum High Performance Retailer or Distributor. Nostrum High Performance products purchased through authorized Retailers/Distributors are to be returned to and refunded by the retailer. Customer may be responsible for any shipping charges that may occur. In the case that a product is deemed defective and covered under warranty, Nostrum High Performance will pay ground shipping back to the customer. Apparel (T-Shirts, hats, etc.), mugs, and decals are not covered by this policy. Warranty is determined solely by Nostrum High Performance, and all product claims are to be inspected according to Nostrum High Performance standards.
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