Description
HKS Injector Upgrade (Top Feed / 750cc) - Subaru STI EJ20 2004-2021
Product Overview: HKS Injector Upgrade (Top Feed / 750cc) - Subaru STI EJ20 2004-2021 is a fuel-system component intended to support reliable fuel delivery for the engine's required airflow and power level. This listing is structured around the exact HKS product/SKU so shoppers can match the component to the intended vehicle or build without relying on a generic product-family description.
Driver Benefit: Correctly sized fuel-system hardware helps maintain consistent fueling under load and provides headroom for calibrated performance increases.
Recommended Use: Best suited to modified engines where fuel demand exceeds or approaches the capability of the original system; professional calibration is generally required.
Technical & Fitment Notes
- Use the HKS part number/SKU as the primary reference when confirming exact configuration and installation requirements.
- Professional installation is recommended when the component affects engine operation, suspension geometry, braking, fuel delivery, or other safety-critical systems.
- Original catalog note: Features: - 6 jet injection hole. - Compared to the previous 800cc (Purple) injectors, the new injector performance has been improved by shorting the invalid injection time. (Voltage 14V and Fuel Pressure 300 kPa Previous 800 cc: 1450 mu sec >>> New 750 cc: 1030 mu sec) - A conversion harness is provided. It can be connected to the factory harness without modification. - O-rings (2-piece) and spacer (backup ring) have been included in the fuel line connector for improved sealing. - All injectors are tested. 4 injectors with similar performance are combined into one kit for one vehicle. Components - Injector (x4) - Conversion Harness - O-Ring (Backup Ring)
Fitment and specifications can vary by HKS part number, model year, trim, transmission, drivetrain, and market. Confirm the SKU and application before ordering, particularly on modified vehicles.