BMW N55-S55 Stage 3 DI injectors

MSRP: $2,199.00
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WHP potential on Gasoline::
1000 WHP* (Calculated assuming 24 MPa fuel pressure and 328 g/(kW/hr)
WHP potential on E85::
730 WHP* (Calculated assuming 24 MPa fuel pressure and 328 g/(kW/hr)
Flow Rate::
20.2 g/s @ 100 bar
Flow rate increase over Stock::
Max Operating Pressure::
250bar / 25MPa / 3625psi
Tune required?:
Recommended Tuning Suite::
Ecutek & Bootmod3

What sets Nostrum apart:

  • +85% Larger than stock <20.2 g/sec vs 10.9g/sec> 
  • +31% larger than EU5 M5 injectors <20.2 g/sec vs 15.4g/sec> 
  • +19% larger than the stage 2 injector <20.2g/sec vs 17.0g/sec > 
  • Direct Fit, no harness or spacers required 
  • OEM decoupling rings pre-installed 
  • Ethanol compatible 
  • OEM comparable spray pattern 
  • Every injector is tested statically and dynamically to ensure best quality product and set batching 
  • Includes comprehensive installation guide 


They’re finally here! The long awaited Stage 3 injectors for the N55 & S55 are now available! Flowing a ridiculous 85% more fuel than the stock injector while still maintaining a 250bar operating pressure rating, the Stage 3’s are what you want when you have a 4 digit horsepower goal in mind. Developed to have an OEM equivalent spray pattern, the Stage 3’s deliver unparalleled performance without sacrificing idle quality or drivability.  

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 that remove layers of protection and safety from your engine. Our injectors operate with all the OEM ECU’s engine management system diagnostics and safety functions – resulting in a much happier and responsive system! 

Inside the box, you will find everything you need to get your new injectors installed quickly, including pre-installed decoupling rings and detailed instructions for a no nonsense install. When you are ready to tune, we can get you set up with one of our trusted certified tuners, or we have injector tuning data available for your existing dealer or tuner.  

Take your Nostrum Stage 3 injectors to the limit by pairing them with our S55 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. 

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.


Frequently ask questions:

Will these also fit an S63?

Yes, but they are batched in sets of 6. For sets of 8, see: S63 Upgraded Injectors

I see a lot of mentions about OEM equivalent spray patterns. What does that mean and why is it 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.

S55 Stage 3 pattern comparison

Vehicle application list: 
  • 2015-2018 BMW F82/F83 M4 
  • 2015-2018 BMW F80 M3 
  • 2016-2019 BMW F87 M2 Competition/CS
  • 2016–2018 F87 M2 (Non-Competition)
  • 2013–2016 F32/F33/F36 435i 
Recommended tuners: 

*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.

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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