The best Grams Performance fuel injector for your build is the one sized to your fuel demand. Grams' 550cc injectors cover bolt-on and mild turbo setups on the WRX, BRZ, 86, FR-S, and 2JZ platforms, while the 1000cc, 1600cc, and 2200cc kits exist for E85, big turbos, and full race builds. All Grams injector sets sold here are flow-matched in sets of four, and a professional tune is required after any injector upgrade.
Grams Performance specializes in high-performance fuel delivery — precision fuel injectors, drive-by-wire throttle bodies, and the supporting hardware that makes an EFI system work under boost. Their injectors are sold in application-specific sets for the platform, which matters because a mis-sized or poorly sealed injector causes idle problems, uneven fuel trims, and drivability headaches. When shopping, match the injector flow rate to your turbo or supercharger plan rather than your current output — injectors that are too small cap the whole build, while injectors that are far too big hurt idle quality and part-throttle driveability.
Grams Performance built its reputation on flow-matched injector sets and motorsport-grade fuel components for import platforms. The brand's catalog centers on high-impedance, drop-in-fit injectors for Honda, Subaru, Toyota, and Nissan engines, sold in sets sized from mild street upgrades up to 2200cc race hardware.
Fuel Injector Clinic is another flow-matched injector specialist, well known for application-specific sets with lifetime warranty support and data-matched tuning files. Many builders compare FIC and Grams side by side when sizing injectors for turbo EJ, FA20, and 2JZ builds.
Aeromotive covers the rest of the fuel system — high-flow in-tank and external fuel pumps, adjustable fuel pressure regulators, and E85-compatible plumbing hardware. If a Grams injector upgrade is going on a car that will also run ethanol or big boost, an Aeromotive pump and regulator are the natural supporting mods. Browse the full fuel system category or fuel pressure regulators to complete the setup.
Sampled standouts include the 550cc fuel injector set for the 2002-2014 WRX, a drop-in upgrade for turbo GD and GR builds, and the 1600cc injector kit for the 2JZ-GE in the 1993-1995 Supra, SC300, and GS300. For forced-induction planning, read our turbocharger upgrade guide for the 2022 WRX to see where injector sizing fits in a full build.
Do I need a tune after installing Grams injectors?
Yes. Any change in injector flow rate changes fueling, so a professional dyno tune or e-tune is required. Running bigger injectors on a stock tune risks a lean condition or a flooded rich condition.
What size injector do I need?
550cc covers most bolt-on and mild turbo street builds. E85 conversions and big-turbo setups typically need 1000cc and up. Tell your tuner your fuel type and target horsepower and size from there.
Are the injector sets plug-and-play?
The application-specific sets include the correct O-rings and connectors for the listed platform. Confirm your year and model before ordering, and replace the O-rings any time the fuel rail comes off.
Can I run E85 with these injectors?
Ethanol needs roughly 30 percent more fuel flow, so E85 builds size up. Verify the fuel pump and lines are E85-compatible too, and tune for the fuel you run.
