What are the best Fuel Injector Clinic injectors for a WRX or STI? For the 2002–2014 WRX and 2007–2021 STI, the answer depends on your power target and fuel — this collection stocks top-feed injector sets from street-sized up to 1650cc and 2150cc for big turbo and E85 builds. Injectors are the first fuel-system part to max out as power climbs: once duty cycle hits the ceiling, the only fix is bigger injectors. If your build is outgrowing the stockers, Fuel Injector Clinic is one of the lines to shop.
Fuel Injector Clinic focuses on high-flow fuel injectors plus the supporting parts that make swaps clean: plug-and-play injector adapters that bridge different connector styles without cutting the harness, and resistor-pack deletes for swaps like the 2JZ-GTE. Most builds also upgrade the pump and regulator alongside the injectors so the whole fuel system keeps up.
What to look for: flow rate (cc/min) sized to your power goal with headroom, top-feed versus side-feed to match your manifold, and connector style — plug adapters solve most harness mismatches. Coverage here includes Subaru WRX/STI top-feed sets, 850cc low-impedance sets for 1G/2G DSM and Evo 8-9, and Toyota Supra 2JZ applications. Comparable injector lines include Injector Dynamics and DeatschWerks.
Popular pieces include the Fuel Injector Clinic 850cc Injector Set for 1990-2006 DSM and Evo. Support the install with fuel system parts, fuel pumps, and fuel pressure regulators, and read our turbocharger upgrade guide before sizing injectors for a turbo swap.
Frequently Asked Questions
Do bigger injectors need a tune?
Always. Any injector change alters fueling across the whole map, so the car must be retuned. Driving to the tuner on a safe base map is standard practice.
What size injectors do I need?
Size to your power target and fuel type, with headroom — E85 and bigger turbos demand substantially more flow than pump gas at the same power level.
Do I need an upgraded fuel pump too?
Usually yes. Injectors can only flow what the pump delivers, so a bigger pump and an adjustable regulator are the normal supporting mods for a serious injector upgrade.
What are the plug adapters for?
They let injectors with one connector style plug into a harness wired for another, with no cutting or splicing. Confirm your injector connector and harness type against the adapter's fitment before ordering.
