Nostrum Subaru EJ 1000cc Twin Spray PFI Injectors

Summary

The EJ is port injected, and on a turbocharged one the standard injector is the first thing to run dry once a VF turbo, a bigger downpipe and an appetite for E85 arrive. This Nostrum set flows 1000cc/min - roughly 66% more than the stock WRX injector - using a twin spray, split gamma pattern with a bend angle developed for the EJ head and intake valves. They go in like a factory part: every seal is in the box and there are no adapters, rails or spacers to buy. The spray is side specific, so each injector is colour marked for its bank.

Best For

• A VF-series turbo WRX or STI at injector duty cycle that cannot safely take more boost or timing.
• Switching to E85 or an ethanol blend, which needs a big step up in injector volume for the same air.
• Sorting the fuel side without cutting an aftermarket rail and spacer kit into the intake manifold.
• Forester XT, Legacy GT and Saab 9-2X Aero builds, where a well-aimed EJ-specific injector is otherwise hard to find.

Getting Past The Stock Injector On A Tuned EJ

Nostrum quotes 1000cc/min against the stock WRX injector, a 66% increase in flow capacity. On a modified EJ that is usually the difference between a tune the calibrator has to protect and one they can actually optimise, because there is finally injector left at the top of the rev range to run the fuel targets the boost demands. Against a generic large port injector the argument is aim rather than size: this one was designed for the EJ port, not adapted to it.

Side-Specific Spray And Why It Is Marked

Most aftermarket port injectors suit many engines, so the cone is a compromise nobody optimised for your head. Nostrum's twin arc pattern is aimed at the back of the EJ intake valves, and because the banks mirror each other the injectors are assigned to a side and colour marked. Fit them the wrong way round and you undo the reason for buying them.

Key Specs

• Manufacturer: Nostrum High Performance
• Product type: port fuel injectors (PFI)
• SKU: L071-1272
• Flow rate: 1000cc/min, 66% more than the stock WRX injector
• Spray: twin spray, split gamma, EJ-specific bend angle, side-specific cylinder assignment
• Included: all required seals, full-colour installation guide, tuning guide for your tuner
• Not required: adapters, aftermarket fuel rails or spacers

Fitment And Setup Checks

Check your model and year below; several earlier cars need a top feed conversion first, which is a separate job. A calibration is needed: COBB tuning guides are available to your tuner, and Nostrum supports open source tuning case by case. Running an ethanol blend? An ethanol content sensing module lets the tune adapt to what actually came out of the pump. Other options sit in the port fuel injector collection.

Vehicle Fitment