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 confirm you need the WRX104X is to check pins A1–A3 on the OEM connector:

• Pins A1–A3 have wires → You need the WRX104X (this listing, 224-4000)
• Pins A1–A3 are empty → You need the WRX107X.

WRX104X mostly covers 2004–2006; 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 → Mostly covers 2007 and some late 2006

Why Choose Link G4X?

• Factory fit, motorsport power – installs in the OEM case with world-class tuning flexibility.
• Plug & play – no wiring loom alterations for supported models.
• Confidence & reliability – proven hardware and software, trusted by tuners worldwide.
• Serious features – advanced boost control, antilag, launch, knock control & 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 within data storage unit
  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  
  
  Download from Link Ecu
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