LINK G4X WRXLink (V10) - WRX107X

Easy to install. Affordable. Reliable.

The Link G4X PlugIn ECU transforms your WRX into a precision-tuned performance machine. Enjoy the latest in engine management technology, fitted directly into your OEM enclosure with no loom modifications required.

Choose the Right Model – Pin Check Required!

The fastest and most reliable way to determine which ECU you need is to check pins A1–A3 on the OEM connector:

• If pins A1–A3 have wires → You need the WRX104X.
• If pins A1–A3 are empty → You need the WRX107X (this listing, 225-4000)

Some late 2006 cars require the WRX107X, so this check is essential.

Vehicle Compatibility

• Designed for WRX V10 EJ25 (2.5L) 2004–2007
• Manual transmission only
• Suits GD/GG chassis with electronic throttle
• Not suitable for GR/GH/GE/GV hatchback or 3rd generation WRX

Model breakdown:
WRX104X → Mostly covers 2004–2006 
WRX107X → Covers 2007 and some late 2006

Why Choose Link G4X?

• Factory fit, motorsport power – fits inside the OEM case, yet offers world-class tuning flexibility.
• Plug & play install – no wiring loom alterations for supported models.
• Confidence & reliability – trusted by tuners worldwide.
• Full feature set – advanced boost control, antilag, launch, knock protection & more.

G4X PlugIn Key Features (where applicable):

Up to 6D fuel and ignition mapping

Precision closed loop cam control (four cam, independent control)

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

512 mega bytes data logging memory

Staged injection

Knock with "windowing"


There are two different options for the expansion connectors, depending on whether your ECU is the 2004-2006 ECU or the 2006-2007 ECU.


2004-2006 ECU

The following expansion connector inputs/outputs are provided:

Blank AN Volt 11

An Temp 4 Temperature sensor input

Blank No function

Blank AN Volt 12

Blank No function

Blank No function

+5V Out Low Current +5V Supply

Gnd Sensor Ground Only



2006-2007 ECU

The 2006-2007 V10 ECU contains an 8 pin expansion connector.

The following expansion connector inputs/outputs are provided:

Aux 11 Auxiliary Output

An Temp 4 Temperature sensor input

Aux 12 Auxiliary Output

Volt 11 Analog 0-5V input

Aux 13 Auxiliary Output

DI 11 Digital Input

+5V Out Low Current +5V Supply

Gnd Sensor Ground Only