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Nostrum Stage 1 Direct Injectors – 15-21 WRX

Nostrum Stage 1 Direct Injectors – 15-21 WRX


Introducing largest DI Injectors for the FA20, flowing 10% more fuel than the factory injector!

These injectors have been carefully developed to fit like factory and have no compatibility issues with a stock WRX FA20F engine, meaning there’s no need to worry about secondary injection controllers, fitting secondary injector hardware, filling meth tanks, or clogged meth injectors. Being that they are compatible with the stock ECU, they are fully tunable with Cobb or EcuTek. 



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  • +10% flow rate increase over stock
  • The only DI injector upgrade on the market for FA20F that works with stock ECU!
  • Set of 4 batched and serialized injectors with tuning data
  • E85 compatible
  • Direct Replacement – same outline as the OE injector
  • OEM equivalent spray pattern
  • OEM ECU controlled (COBB tuning recommended)

Performance Specs:

  • WHP potential on gasoline: 620 WHP (calculated with driveline of 90%, 61% duty cycle,  at 7000rpm, with 328 BSFC)
  • WHP potential on E85: 460 WHP (calculated with driveline of 90%, 61% duty cycle,  at 7000rpm, with 444 BSFC)
  • Tune Requirement: Yes
  • Recommended Tuning Suite: COBB Access Tuner
  • Flow rate increase over Stock: 10%
  • Flow rate: 15.7 g/s at 100 bar
  • Max Operating Pressure: 150bar / 15MPa / 2175psi


  • Set of 4 injectors, tested & batched set with serial number
  • Installation instructions
  • Tuning guide (Dealer & Certified Tuners only)

Bundle up!

To take full advantage of your new injectors, we would recommend pairing them with Nostrum’s HPFP upgrade for the FA20. Flowing 40% more than the factory pump, the Nostrum HPFP will not only allow you to dial in more torque earlier in the rev range, but also gain peak horsepower by providing the upgraded injectors with the additional fuel that they need! Bundling the pump and injectors together saves you money! 

Peace of mind.

Nostrum backs every part we sell with a limited lifetime warranty. All Nostrum products 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. 



  • 2015-2021 WRX


Installation Guide

Install Guide