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.

Click here to download the full Specifications PDF.