Link G4X WRX6X Plug-In ECU – Subaru WRX and STI V5 to V6 EJ20 (MY99 to MY00)

WRXLink – WRX6X G4X Plug-In ECU for Subaru WRX and STI V5 to V6 EJ20. Easy to install, affordable, and reliable. This ECU fits inside the factory OEM enclosure and connects to the original wiring loom with no changes required for the supported models.

Designed for

WRX and STI Version 5 to Version 6 with EJ20 engine (model years MY99 and MY00).

Suitable applications (228-4000)

• GC8F
• GC8G
• WRX and STI from 09/1998 to 08/2000
• MY99 and MY00

Important fitment notes

• Manual transmission only
• Air temp sensor highly recommended
• Please check your pinout matches the header shown in the product photos before purchasing
• Most factory features are supported

Powered CAN port

From hardware version 1.4 onward, this plug-in includes a 4 pin powered CAN connector. It does not use the older CANPCB cable. Use the CANJST4 cable (Code 101-0198) to connect CAN devices. The port provides CAN plus a protected 12 V power supply and ground for peripherals, protected by a self-resetting 3 A fuse.

G4X PlugIn key features

• Up to 6D fuel and ignition mapping
• Precision closed loop cam control, four cam independent where applicable
• Sequential fuel delivery
• Digital triggering, supports 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
• Supports Hall, VR, or optical sync and crank sensors
• Boost control referenced to gear, speed, or throttle position
• 512 MB data logging memory
• Staged injection
• Knock control with windowing

I/O options

XS connector 1

• GND — Sensor Ground Only
• +5V Out — Low Current +5V Supply
• DI 8 — Digital Input
• DI 9 — Digital Input
• AN Volt 8 — Analog 0 to 5 V input
• AN Volt 9 — Analog 0 to 5 V input
• Ign 7 — Ignition 7 Auxiliary Output
• Ign 8 — Ignition 8 Auxiliary Output

Expansion connector 2

• GND — Sensor Ground Only
• +5V Out — Low Current +5V Supply
• DI 5 — Digital Input
• DI 7 — Digital Input
• AN Volt 5 — Analog 0 to 5 V input
• AN Volt 6 — Analog 0 to 5 V input
• AN Temp 2 — Temperature sensor input
• AN Temp 3 — Temperature sensor input

Downloads

• 📘 Specifications — G4X WRXLink WRX6X
• 🛠️ Installation Guide — G4X WRXLink WRX6X
• 🧰 Wiring and Pinout — G4X WRXLink WRX6X

More ECU resources are added over time. See our ECU Downloads and Resources page for updates.