IAG Performance IAG Spec High-Flow Direct Fuel Injector Set By Nostrum 15-21 WRX / 14-18 Forester XT

Take your Subaru’s fuel delivery to the next level with the IAG Spec High-Flow Direct Fuel Injector Set, developed in collaboration with Nostrum. Designed for direct fitment, these injectors improve flow, maintain OEM-quality spray patterns, and support high-performance applications, including E85 use.

• Up to 10% Higher Fuel Flow: Delivering more fuel than stock injectors while maintaining precise atomization for reliable cold starts, stable idle, and quick throttle response.
• E85 Compatible: Supports ethanol and blended fuels, offering cooler combustion, higher detonation resistance, and race-fuel performance benefits.
• Performance Potential:
  • Gasoline: ~620 WHP potential (based on 10% drivetrain loss, 61% duty cycle, 7000 RPM)
  • E85: ~460 WHP potential (based on 10% drivetrain loss, 61% duty cycle, 7000 RPM)
• Specifications:
  • Flow rate: 15.7 g/s @ 100 bar
  • Max operating pressure: 150 bar / 2200 psi
  • Tune required (COBB or EcuTek recommended)

Direct-fit design mounts like factory injectors, complete with necessary hardware and fittings. Installation takes roughly one hour with basic hand tools.

Fully compatible with stock ECU and tunable via COBB engine management for optimal performance. Pair with the IAG Spec High-Pressure Fuel Pump (sold separately) for maximum flow and horsepower potential.

Included: 

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

Frequently Asked Questions:

Q: Is a tune required? 

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

Q: Are these injectors Ethanol compatible?  

A: Yes, these injectors are fully ethanol compatible 

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 incompatible with these upgraded WRX injectors. 

Installation Guide