Link G4X WRXLink (7–9) WRX9X ECU

The Link G4X WRXLink (7–9) WRX9X ECU is a direct-fit engine management system designed for Subaru WRX V7–V9 platforms using the EJ20 engine. It installs into the factory ECU enclosure and connects directly to the OEM wiring loom with no modification required.

This ECU is intended for manual transmission vehicles only and supports factory cam control while providing advanced tuning capability through the G4X platform.

Important: Designed for 2.0L EJ20 engines with cam control. This ECU fits 5-plug factory ECUs only. Air temperature sensor is highly recommended. Please confirm your ECU connector matches the header shown in the product images before purchase.

Engine Control Capability

• Designed for EJ20 turbo engines
• Sequential fuel injection
• Digital triggering using OEM patterns
• Precision closed loop cam control
• Staged injection support
• Knock control with windowing

Hardware and Platform

• Direct plug-in installation using factory ECU enclosure
• Continuous onboard barometric correction
• USB tuning connection
• CAN communication support
• 512 MB onboard data logging

Vehicle Compatibility

• Subaru WRX V7–V9 EJ20 (MY2000–2007)
• GD and GG chassis
• 2.0L models with cam control only
• 5-plug factory ECU
• Manual transmission only

G4X Plug-In Key Features

• Up to 6D fuel and ignition mapping
• OEM idle hardware supported
• 5D boost control with three switchable tables
• Launch control, anti lag, and flat shift
• Individual cylinder fuel and ignition correction
• Gear-based fuel, ignition, and boost compensation
• QuickTune automated fuel tuning
• Selectable dual fuel, ignition, and boost maps
• CAN communication support

I/O Expansion

Expansion Connector 1

• Ign 6 – Ignition auxiliary output
• Ign 7 – Ignition auxiliary output
• Ign 8 – Ignition auxiliary output
• DI7 – Digital input
• DI8 – Digital input
• DI9 – Digital input
• Analogue Temperature 4
• Analogue Voltage 11 (0–5V)

Expansion Connector 2

• GND – Sensor ground
• +5V Out – Low current +5V supply
• Aux 9 – E-throttle (not usable as auxiliary output)
• Aux 10 – Auxiliary output
• Analogue Voltage 6 (0–5V)
• Analogue Voltage 7 (0–5V)
• Analogue Voltage 9 (0–5V)
• Analogue Voltage 10 (0–5V)

Downloads and Resources

• Installation Manual (PDF)

View all Link ECU Resources