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:
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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?
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Factory fit, motorsport power – fits inside the OEM case, yet offers world-class tuning flexibility.
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Plug & play install – no wiring loom alterations for supported models.
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Confidence & reliability – trusted by tuners worldwide.
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Full feature set – advanced boost control, antilag, launch, knock protection & more.
G4X PlugIn Key Features (where applicable):
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Up to 6D fuel and ignition mapping
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Precision closed loop cam control (four cam, independent control)
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Sequential fuel delivery
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Digital triggering, all OEM patterns
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OEM idle hardware supported
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5D boost control with three switchable tables
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Motorsport features - antilag, launch, flat shift
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Continuous barometric correction (on board)
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CAN port
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QuickTune - automated fuel tuning
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Individual cylinder correction
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USB tuning cable included
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Stats recording into on-board memory
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Gear compensations for spark, boost and fuel
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Real time selectable dual fuel, ignition and boost maps
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Sync and crank sensors can be a combination of Hall effect, variable reluctance or optical
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Boost control referenced to gear, speed or throttle position
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512 mega bytes data logging memory within data storage unit
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Staged injection
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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
Download Manual
Click here to download the user manual.
Click here to download the full Specifications PDF.
