HKS Fuel Upgrade Kit 2004-2021 STI

Enhance your Subaru WRX STI’s fueling system with the HKS Fuel Upgrade Kit, designed for models from 2004 to 2021. This premium kit delivers improved fuel injector performance, ensuring smoother throttle response and better engine efficiency for enthusiasts seeking reliable power gains.

The kit features the latest generation BOSCH top-feed fuel injectors, carefully spray tested and matched in sets of four by HKS to guarantee consistent flow rates and spray patterns. Injector dead time is significantly reduced (from 1.35ms to 0.9ms at 14V and 300kPa), improving responsiveness. Included are upgraded O-rings and spacers for enhanced sealing on the fuel line connectors, plus an adapter harness for seamless OEM plug compatibility. A high-flow upgraded fuel pump is also part of the package, ensuring your STI gets the fuel it demands under boost.

Ideal for Subaru WRX STI owners looking to upgrade their fueling system for performance or reliability, this kit is a direct-fit solution that combines quality and precision. Trust Subimods for specialized Subaru parts and shop today to boost your STI’s fueling performance.