2.0L Subaru Stage 1 Direct Injectors

Was: $799.00
Now: $703.00
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WHP Potential on Gasoline:
620 WHP
WHP Potential on E85:
460 WHP
Tune requirement:
Recommended Tuning Suite:
Flow Rate Increase Over Stock:
Max Operating Pressure:
150bar / 15MPa / 2175psi

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. 

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. 


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


  • +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

Certified Tuners:

Clark Turner Tuning - Arizona
BCP Tuning - Michigan

Frequently Asked Questions

Q: Is a tune required? 

A: A tune is not required to start the vehicle, but to maintain drivability we recommend a tune after install. 

Q: Are these injectors Ethanol compatible?  

A: Yes, these injectors are fully ethanol compatible 

Q: How are you able to offer Stage 1 injectors for a lower cost than oem injectors? 

A: As the leader in high performance aftermarket DI fuel systems, Nostrum’s partnerships with OEM suppliers allow us to offer products that are competitive with Subaru dealer parts. Without Subaru dealer markup. 

Q: When will Nostrum have a stage 2 injector for the FA20F engine?  

A: Keep an eye on our social media to be up to date with all of our new product releases! 

Q: Can I use these injectors in my BRZ’s FA20A engine?  

A: The FA20 found in the BRZ runs a completely different style of direct injector and are imcopatible with our Stage 1 injectors. 

Q: What happened to the big injectors that you set the DI-only WRX world record (640 whp) with? Can I buy those?  

A: Those injectors were prototypes that required aftermarket engine management to use, our shop WRX had a Motec ECU. The prototypes no longer exist and we have no plans of reproducing or releasing those injectors. 

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