Subaru WRX & STI V10 Impreza WRX & STI - 06–07 Plug-In ECU

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 of the processing unit 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 tab for I/O input & output expansion options  

Suitable Applications for 225-4000 Automotive Computer Unit:
The WRX104X (listed separately) mostly covered the 2004-2006 range.
The WRX107X mostly covers the 2007 model.

However, some 2006 models require the WRX107X 

*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 WRX104X, if there are no wires, you need the WRX107X 

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

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 megabytes 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 Manual

Click here to download the full Specifications PDF.