Link ECU G4X WRX104X PlugIn ECU fits the Subaru Impreza WRX & STI EJ25 V10 2004-2006

Link G4X Subaru WRX104X Plug-In ECU – WRX V10 EJ25 2004-2006

The Link G4X Subaru WRX104X Plug-In ECU gives you modern standalone engine management while retaining the convenience of a genuine plug-in ECU.

Designed specifically for the Subaru WRX Version 10 GD/GG with EJ25 engine from 2004 to 2006, the WRX104X fits directly into the factory ECU location using the original mounting points, wiring loom and ECU connectors.

No replacement engine loom or adaptor harness is required. The ECU is designed to work with the factory wiring while retaining supported original vehicle functions and maintaining a clean, factory-style installation.

A startup map is included to help get the engine running ready for final setup and calibration.

The WRX104X uses the same processor, firmware and PCLink software as the rest of the Link G4X range and includes the standard G4X feature set.

Suitable Applications

The WRX104X is designed to suit:

• Subaru WRX Version 10

• GD / GG chassis

• EJ25 engine

• 2004 to 2006 models

WRX104X or WRX107X?

The WRX104X covers 2004 to 2006 models.

For 2007 and some late 2006 models, use the WRX107X Plug-In ECU

Check the ECU connector pins before ordering:

• If pins A1-A3 have wires, you need the WRX104X 

• If pins A1-A3 are empty, you need the WRX107X 

Important Compatibility Information

Please check your original ECU connector arrangement against the ECU header shown in the product photos before ordering.

• Suitable for manual transmissions only

• Most factory features are supported

• Built-in E-Throttle / Drive-by-Wire control

G4X WRX104X Features

• Dual CAN Bus

• E-Throttle Control

• Flex Fuel

• Trigger Oscilloscope

• 3 Axis Accelerometer

• Selectable Temperature Input Pull-ups

• Flexible Engine Protection Limiters

• CAN Keypad Control

• VVT Control

• Open Loop Boost Control

• Closed Loop Boost Control

• Dual Closed Loop Lambda

• Compatible with leading aftermarket displays via CAN or serial stream

• 512MB Internal Data Logging

Motorsport Features

• Nitrous Control

• Launch Control

• Anti-Lag

• Cruise Control

• Traction Control

• Race Timer and Power Management

• Gear Shift Control

• Paddle Shift Control

Inputs and Outputs

For the complete list of available inputs and outputs, please refer to the Link WRX104X Installation Manual.

Communications

• 2 CAN Bus Channels

• LTW 6-Pin USB Tuning Connection

Dimensions

Length: 190mm
Width: 160mm
Height: 30mm

Weight

260g

Electrical Specification

Operating Voltage Range: 6.5V to 24V
Maximum Input Voltage: 36V
Maximum Continuous Current Draw: 8.5A

What's Included

• Link G4X Subaru WRX104X Plug-In ECU

• Anti-static strap

• USB tuning cable

• Link stickers

• Plug-In manual card

• Product registration card

Please Note

The ECU is supplied with a startup map to assist with initial setup. This is not a finished vehicle calibration.

Professional setup and tuning are recommended before the vehicle is driven under load.