Description
HKS Fuel Upgrade Kit (650cc) - 2004-2021 Subaru WRX
Product Overview: HKS Fuel Upgrade Kit (650cc) - 2004-2021 Subaru WRX 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: Includes: 4 x 650cc Injectors and Upgraded HKS Fuel Pump Features: - Designed with the latest generation BOSCH Top Feed type fuel injector. All injectors have been passed the spray test and similar performance injectors are picked up and packaged in one kit for each car. - Improved injector performance results in a shorter injector dead time. - (1350musec => 900musec at Voltage 14V and Fuel Pressure 300kPa) - O-rings (2-pieces) and spacer (back-up ring) have been added to the fuel line connector for improving sealing. - Stock harness connector converter is included. - Includes same fuel pump in our previous fuel upgrade kit. Replacing connector and small modification of fuel case are necessary when installing to GRB/GVB. Note: Injector nozzle is conical type (1spray) which is different from our previous 2-Jet type products. Please do not use the same fuel setting data due to the diffe
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.