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Link G4X Plug In Subaru Impreza 04-06 WRX/STI (GD/GG 2.5L models with E-throttle)

$2,501.25 Out of Stock

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Easy to install. Affordable. Reliable.  

G4X PlugIn ECUs offer the latest in engine management technology, designed to easily maximize the potential from your car.  
This ECU fits inside the factory OEM enclosure. Installation is a breeze, with no alteration of the factory wiring loom required for the models listed below. 

Designed for the WRX V10 EJ25. These ECUs cover 2.5L from 2004 to 2007. 

  • Please check your connector matches the header in the listed photo and check the notes in italic below before purchasing.  
  • This ECU works for manual transmissions only.  
  • Air temp sensor highly recommended. 
  • Most factory features are supported. 
  • Check the features for I/O expansion options  

Suitable Applications:
The WRX104+ mostly covered the 2004-2006 range. 
The WRX107+ mostly covers the 2007 model (listed separately). 
However, some 2006 models require the WRX107+ 
*The fastest and most reliable way to tell, is to check whether pins A1-3 are populated. 

*If the pins have wires, you need the WRX104+, if there are no wires, you need the WRX107+

*Suits GD or GG chassis with electronic throttle.  Not suitable for the GR/GH/GE/GV hatchback or 3rd generation WRX’

To make the most of your engine setup, you need a powerful and configurable ECU to control your engine. With the advancements in modern computing technology, a standard ECU can't compete with a Link G4X . This ECU is a plug in replacement for the factory computer. This keeps installation hassle-free and will suit almost all road and mildly modified race vehicles. The Version 10 WRX & STI were produced from 2004 until 2007. If you're unsure on your exact model you can contact us.

Please note there are 2 ECU versions for the V10 WRX/STI. Please read this section carefully to select the corret ECU for your car. The PBMS Team is more than happy to assist if you are unsure. 

It is essential that a compatibility check is performed before installing the ECU into the vehicle. Failure to do so may void the warranty. There are some cases where the same ECU connector is used on very similar vehicle models but with a completely different pinout.

There are two different Subaru Impreza WRX V10 ECUs available. These are categorised as 2004-2006 2500cc and 2007 2500cc. This maybe slightly misleading as some 2006 vehicles require a 2007 ECU.
It is critical that the correct ECU for the vehicle is installed, failure to install the correct ECU can result in engine component, engine wiring or ECU damage.

The correct ECU can be verified by studying the wiring loom.
If pins A1, A2 and A3 (see pinout section) contain no wires, then the correct ECU required is the 2007 2500cc version. If these pins contain wires, then the correct ECU is the 2004-2006 2500cc version.

Subaru WRX V10 ECU Header Connector

Suitable Applications:
The WRX104+ mostly covered the 2004-2006 range. 
The WRX107+ mostly covers the 2007 model (listed separately). 


  • Safety features to protect engine damage (addition sensors may be required)
  • Internal boost control
  • Complete tunability to suit your package and application
  • Allows for Air flow meter removal
  • Motorsport functions (launch control and antilag)
  • Plug-in simplicity


  • Dyno tuned and installed by a Link ECU expert
  • Intake air temperature sensor fitted to vehicle
  • XS loom used to wire in additional switches, dials or sensors
  • Factory MAP sensor upgraded if exceeding 20PSI boost

G4X PlugIn Key Features

  • Up to 6D fuel and ignition mapping
  • Precision closed loop cam control (four cam, independent control) [Upgraded cylinder heads and wiring required]
  • Sequential fuel delivery
  • Digital triggering, all OEM patterns
  • OEM idle hardware supported
  • 5D boost control with three switchable tables
  • Motorsport features - antilag, launch, flat shift
  • Continuous barometric correction (on board)
  • CAN port
  • QuickTune - automated fuel tuning
  • Individual cylinder correction
  • USB tuning cable included
  • Stats recording into on-board memory
  • Gear compensations for spark, boost and fuel
  • Real time selectable dual fuel, ignition and boost maps
  • Sync and crank sensors can be a combination of Hall effect, variable reluctance or optical
  • Boost control referenced to gear, speed or throttle position
  • Up to 512Megabytes data logging
  • Staged injection
  • Knock with "windowing"

Free yourself from the constraints of the factory ECU.

The Link G4X WRXLink (04) WRX104X PlugIn fits the Subaru WRX & STI V10 2004-2006. The ECU PCB fits discretely inside the original factory enclosure. 

Installation of Link's Subaru WRX104X ECU is a breeze - no alteration of the factory wiring loom is required. A built-in connector (or pins in some models) provides additional inputs and outputs such as oil pressure inputs or anti-lag / logging switches. 

MAP Sensor not included.

If you are unsure if the above PlugIn will fit your vehicle, contact us check the pinout information in PC Link.
Some PlugIns above are known to fit other vehicles. To confirm yours, get in contact with us or the Link Tech team.

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