Link ECU, STi & WRX 2007 – 2021  

With Link’s extensive development these Plug and Play STI ECU’s retain factory functions including Driver’s Control Centre Differential (DCCD), Hill Start Assist, SI-DRIVE, and Cruise Control.

G4X Plugin ECUs offer the latest in engine management technology, designed to easily maximize the potential from your car. With all your favorite motorsports functions and features such as launch control, antilag and flex fuel this is a truly versatile plug n play ECU for the STI. The Link PnP ECU fits inside the factory OEM enclosure to make installation a breeze, with no alteration of the factory wiring loom required for the 07-10 sti/wrx using the denso ecu. If you have any questions or requests don’t hesitate to let us know, we are here to support you and your build ever step of the way. Sti Link ECU guide

G4X Plugin Key Features:

• 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 – anti-lag, launch, flat shift
• Continuous barometric correction (on board)
• CAN port
• Quick Tune – 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
• Staged injection
• Knock with “windowing”

I/O Options Expansion connector 1 inputs/outputs are provided:

• Pin 1 Aux 16
• Pin 2 DI 11
• Pin 3 An Temp 4
• Pin 4 Knock 2
• Pin 5 Injector 6

If you don’t already have the following electronics/parts in your car these are the most popular and performance orientated accessories/sensors for the Sti, WRX using the Link plug n play STI/WRX ecu

• The AEM X series AFR gauge/sensor or the Haltech wideband o2 controller and sensor for closed loop fueling functions.
• Optional flex fuel, fuel pressure and oil pressure inputs are all standard inputs on the Elite 2500 ecu and highly recommended. These sensors support engine protection features key to any reliable race car.
• VE wideband knock kit (single sensor kit for EJ25 engines) This is a flat response Bosch motorsport knock sensor complete with shielded coax wire harness. These are the most effective knock kits available and offer better knock feedback than even the OEM Subaru knock sensor.
• ID1050x STI and WRX Injector dynamics 1050cc Injectors, 350-450whp
• ID1300x injectors STI perfect for power levels between 450-650whp
• ID1700x injectors STI provide good idle with ability to support 550-850whp
• ID2600xds injectors STI  Over 2600cc of flow these are the best injectors for any high power alcohol fueled EJ engine 750-1300whp

Please check your ECU for Denso branding and the connector matches the photo above before purchasing, if you have any doubts please send us a picture and we can ID your ECU for you. Hitachi ECU’s are not supported by this exact product if you have a Hitachi ECU in your STI or WRX you will need our  STI plug n play Haltech Elite 2500 package.  

This ECU is for off road Motorsports use only. Never to be used on public roads within the USA, please check your local laws and regulations before you modify any vehicle. Please be sure to check the full Link ECU guide to ensure you get the correct ECU for your STI! Link ECU application guide.