Link G4X Plug-In ECU Subaru WRX V10 EJ25 WRX104X

The Link G4X Plug-In ECU WRX104X is a direct replacement ECU designed to install inside the factory enclosure with no wiring modifications required. It provides full standalone engine management while retaining most factory sensors and key systems.

This ECU is suited to Subaru WRX V10 EJ25 engines and is ideal for performance street and track builds. It delivers reliable tuning control and motorsport features while maintaining factory integration, without the complexity of a full wire-in ECU.

Why Choose a Plug-In ECU

• No wiring modifications required
• Retains most factory sensors and systems
• Faster installation compared to wire-in ECUs
• Ideal for street and performance builds

Supported Vehicles

• Subaru WRX V10 EJ25 2004 to 2007
• GD and GG chassis
• Electronic throttle models

Important Fitment Check

• If pins A1 to A3 have wires, this is the correct ECU
• If pins A1 to A3 are empty, WRX107X is required

Key Features

• Direct plug-in ECU with factory fitment
• Up to 6D fuel and ignition mapping
• Sequential fuel injection
• Closed loop cam control
• 5D boost control with multiple tables
• Motorsport features including antilag, launch and flat shift
• CAN bus support
• 512MB onboard logging memory
• QuickTune automated fuel tuning
• Individual cylinder fuel and ignition correction
• Dual fuel, ignition and boost maps

Important Notes

• Manual transmission only
• Check connector matches before purchase
• Pin check required before ordering

Communications

• USB tuning connection
• CAN bus via 4 pin powered connector

Logging and Control

• 512MB logging memory
• Real time tuning via PCLink software
• Stats recording and diagnostics

I/O Expansion

• Analog voltage inputs available
• Temperature inputs available
• 5V sensor supply and sensor ground