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  

Recommended tuners: 

• Bend Calibration

• David Shoup

• Paul Johnson Tuning

• HCPerformance Tuning

• Cary Jordan