IAG Spec High-Flow Direct GDI Fuel Injector Set By Nostrum For 2022+ Subaru WRX

IAG Performance and Nostrum have joined forces to develop the IAG Spec High-Flow Direct GDI Fuel Injector Set by Nostrum. This fuel injector upgrade is a direct fit for 2022+ WRX, 2019+ Ascent, 2020+ Legacy XT Sport, and 2020+ Outback XT & Wilderness Subaru models equipped with the FA24 2.4L engine. Built for the FA24’s direct injection system, these GDI (Gasoline Direct Injection) injectors deliver fuel straight into the combustion chamber under extremely high pressure, allowing for precise fuel delivery and improved performance. The injectors provide increased fuel flow while maintaining an OEM-quality spray pattern for improved power potential without sacrificing drivability.

The IAG Spec High-Flow Direct GDI Fuel Injector Set delivers up to 24% more fuel flow than the stock Subaru injectors, giving your FA24 the additional fueling capacity needed to support higher horsepower and increased boost levels. Despite the added flow, these injectors maintain an OEM-quality spray pattern to ensure smooth cold starts, stable idle, and responsive throttle. For maximum fueling performance, pair them with the IAG Spec High-Pressure Fuel Pump by Nostrum for the 2022+ Subaru WRX, which increases pump flow by 37% over the OEM unit and helps unlock even greater horsepower potential.

The FA24 engine features a cast aluminum coolant crossover pipe that can make standard injector connectors difficult to install. To address this, one injector in the set is engineered with an extended harness connector lead that provides the clearance needed for an easy installation without modifications. This injector installs in Cylinder 1, and the included installation guide provides step-by-step instructions for a straightforward installation process.

The IAG Spec High-Flow Direct GDI Fuel Injector Set by Nostrum is fully compatible with E85 and blended ethanol fuels. Running ethanol offers several advantages for performance builds, including cooler combustion temperatures, cleaner burning characteristics, and greater resistance to detonation than standard pump gas. With proper tuning and the right supporting fuel system components, these injectors provide the reliable fuel delivery needed to support the higher demands of ethanol-powered performance setups.

WHP potential on gasoline: 600 WHP (Calculated based on 290 BSFC, 40% injector DC, 10% driveline loss & 20 MPa fuel pressure)
WHP potential on E85: 480 WHP (Calculated based on 360 BSFC, 40% injector DC, 10% driveline loss & 20 MPa fuel pressure)
Tune Requirement: Yes
Recommended Tuning Suite: COBB (WRX, Legacy, Outback, and Ascent – WRX only 2022+)
Flow rate increase over Stock: 24% (compared to stock flow of 14.146 g/s)
Flow rate: 17.5 g/s at 100 bar
Volume Flow rate (nHeptane) : 1450 cc/min
Max Operating Pressure: 240 bar / 24 MPa / 3480 psi
Spray Pattern: OEM Comparable

Since these injectors provide significantly more fuel flow than the factory units, professional ECU calibration is recommended for proper cold starts, accurate fuel trims, and smooth drivability. These injectors remain compatible with the stock Subaru ECU and can also be tuned using COBB engine management devices to help maximize performance. A list of Nostrum Certified Tuners is provided below for calibration support.

Nostrum is a trusted name in the automotive industry, specializing in high-performance fuel system solutions. Their products are meticulously engineered and rigorously tested to meet or exceed OEM standards. Nostrum's dedication to in-vehicle development and calibration ensures that their fuel components are optimized for peak performance. Together, Nostrum and IAG have formed a perfect partnership to bring you the very best in innovative, high-performance fuel solutions for your Subaru.