LINK SUBARU WRXLINK (04) - WRX104X IMPREZZA WRX & STI, 04-06

Link WRX104X Plug-In G4X Engine Management for 04-06 Subaru WRX & STI

Take full control of your 2004-2006 Subaru Impreza WRX or STI with the Link WRX104X, a true plug-in ECU that installs in your factory enclosure and delivers the latest Link G4X engine management technology.

Why Choose the Link WRX104X?

• True plug-in fitment: Installs directly inside the factory OEM ECU enclosure, with no cutting, splicing, or alteration of the factory wiring loom required.
• Built for the 04-06 EJ25: Designed specifically for the WRX V10 2.5L engine used in GD/GG chassis Impreza WRX and STI models with electronic throttle.
• Manual transmission only: Confirm fitment by checking your factory ECU connector. If pins A1-3 are populated with wires, the WRX104X is the correct match; if they are unpopulated, use the WRX107X instead.
• Advanced fuel and ignition control: Up to 6D fuel and ignition mapping, sequential fuel delivery, digital triggering across all OEM patterns, and individual cylinder correction for precise, consistent tuning.
• Precision cam and knock control: Closed-loop cam control across all four cams, independently managed, plus knock control with windowing for tighter, more reliable tuning.
• Sophisticated boost management: 5D boost control with three switchable tables referenced to gear, speed, or throttle position, plus gear compensation for spark, boost, and fuel.
• Motorsport-ready features: Anti-lag, launch control, and flat-shift functionality, with real-time selectable dual fuel, ignition, and boost maps for track-day flexibility.
• OEM integration retained: Continuous onboard barometric correction, OEM idle hardware support, and most factory features preserved for everyday drivability.
• Serious data capabilities: 512 MB of onboard data-logging memory, stats recording, a CAN port, and QuickTune automated fuel tuning to streamline calibration.
• Everything you need to get started: A USB tuning cable is included. An aftermarket air temperature sensor is highly recommended for best results.
• Room to grow: I/O expansion options are available for builds requiring extra inputs and outputs; see the features tab for details.

Fitment Notes

The WRX104X is suited to GD/GG chassis WRX and STI models with electronic throttle only. It is not compatible with GR/GH/GE/GV hatchback or third-generation WRX models. Always check your connector against the pinout notes above before ordering.

Whether you are driving roads across Canada or chasing lap times at the track, the Link WRX104X provides an engine management foundation for your 04-06 WRX or STI without the hassle of rewiring your car.