LINK SUBARU WRXLink (3-4) - WRX4X

Link G4X WRXLink (3-4) — WRX4X Plug-In ECU

Drop-in engine management for your Subaru WRX or STI, built to slot straight into the factory ECU enclosure with no cutting, splicing, or rewiring of your factory loom.

Why WRX Owners Choose the WRX4X

The Link WRX4X is a true plug-in replacement for the factory ECU on manual transmission WRX and STI models, designed to provide modern engine management without a full rewire. It fits inside the OEM enclosure, uses your existing connectors, and retains most factory features out of the box.

Fitment

• Subaru WRX & STI, V3–V4, GC8D/GC8E
• 09/1996 to 08/1998
• EJ20 engine
• Manual transmission only
• Please confirm your connector matches the header shown in the listing photo before ordering.

Engine Management Features

• Up to 6D fuel and ignition mapping for precise tuning across the full operating range
• Sequential fuel delivery with staged injection capability
• Precision closed-loop cam control, with independent control on all four cams
• 5D boost control with three switchable tables, referenced to gear, speed, or throttle position
• Motorsport features including anti-lag, launch control, and flat shift
• Knock control with windowing, plus continuous onboard barometric correction
• Real-time selectable dual fuel, ignition, and boost maps
• Individual cylinder correction and gear compensation for spark, boost, and fuel
• Digital triggering compatible with all OEM patterns, supporting Hall effect, variable reluctance, or optical crank and cam sensors
• OEM idle hardware supported
• CAN port for expanded connectivity
• QuickTune automated fuel tuning to speed up dial-in
• 512 MB onboard memory for data logging and stats recording

Expansion & Tuning

• Two expansion connectors (XS1 and XS2) adding digital inputs, 0–5V analogue inputs, temperature sensor inputs, auxiliary ignition outputs, plus dedicated +5V supply and sensor grounds. See the features tab for the full I/O breakdown.
• USB tuning cable included

Good to Know Before You Install

• An air temperature sensor is highly recommended for accurate tuning.
• E-Throttle requires a modification before it is usable.
• Most factory features are supported; check the features tab for specifics.

Whether you are building for the street or the track, the WRX4X delivers the tuning depth and reliability Link is known for in a straightforward, factory-fit installation for your WRX or STI.