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 V5-6 EJ20.

Please check your pinout matches the header in the listed photo 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

Note: V1.4 onwards of this Plug-in features a new 4 pin powered CAN connector and cannot use the old CANPCB cable for CAN connection. Use the CANJST4 (Code 101-0198) cable for connecting CAN devices. This new 4 pin port and cable provides not only the CAN connection, but also a protected 12V power supply and ground for powering the CAN devices. The power supply is protected by a self-resetting fuse rated at 3A continuous.

Suitable Applications for 228-4000 automotive computer unit:
GC8F
GC8G
WRX and STI from 09/1998 to 08/00
MY99 & MY00

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 data storage unit
Staged injection
Knock with "windowing"

The following expansion connector inputs/outputs are provided:
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 0-5V input
An Volt 9 Analog 0-5V 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 0-5V input
An Volt 6 Analog 0-5V input
An Temp 2 Temperature sensor input
An Temp 3 Temperature sensor input

SUBARU PLUG IN