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Grams Performance


Grams Performance 550cc Fuel Injectors - Subaru WRX 2002-2014 / STi 2007-2020 (+Multiple Fitments)

Each injector is individually balanced, flow tested, and dynamically matched for characterization within one percent of one another. To ensure leak- free operation and optimal performance, each injector is then pressure tested up to 220 psi. The results are unmatched cylinder-to-cylinder consistency, even at low pulse widths, as well as optimal idle quality, response, and performance. Grams Performance Fuel Injectors’ ultra-fast and precise solenoids feature a linear response curve across a wide range of operating conditions and can accurately meter fuel even at the highest pressures and shortest pulse widths.

Grams Performance injectors are cold-cut with diamond grinders in less than three seconds for high precision without “pre-seating". Abrasive cutting creates heat, which leads to poor spray patterns and the need for competitors to pre-seat their injectors to reduce distortion. Each injector is also fitted with high-quality Viton O-rings that are resistant to extreme temperatures and harmful oils found in some fuels.

Each injector set includes dead time compensation values to help ensure consistent air/fuel ratios and optimal performance when tuning. Grams Performance Fuel Injectors are carefully tested and matched in controlled laboratory environments using state-of-the-art equipment and are subjected to rigorous dyno, street, and race track testing to ensure proper performance in the most extreme conditions.

- High-impedance design with no resistor box required
- Cold-machined tips for high-precision operation
- Ultra-fast solenoids for precise fuel metering
- Linear response across a wide range of operating conditions
- All injectors balanced, blueprinted, and matched within one percent
- Compatible with all known fuels including gasoline, methanol, and ethanol
- Unmatched cylinder-to-cylinder consistency and optimal idle quality

  • 2002-2014 Subaru WRX
  • 2007-2020 Subaru STi
  • 2004-2013 Subaru Forester XT
  • 2007-2011 Subaru Legacy GT / Legacy GT Spec B
  • 2007-2009 Subaru Outback XT

Note:May be compatible with other models if top feed tgvs & fuel rails are installed. 


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