Subaru Legacy / Liberty standalone ECUs
Subaru's all-wheel-drive mid-size sedan and wagon; turbo GT versions used the EJ20, some twin-turbo.
- Chassis
- BC/BF · BE/BH · BL/BP
- Years
- 1999–2005
- Engines
- EJ20 · EZ30 (3.0R) / EJ20 (GT) · EJ20 twin-turbo
- Layout
- 4 or 6-cylinder, AWD
You have 3 plug-in ECU options for the Subaru Legacy / Liberty from Haltech and Syvecs, 1 of them direct plug-in. The cheapest complete setup is Haltech at US$2,120 including the ECU. 55 wire-in ECUs can also run its 4 or 6-cylinder engine with a custom loom, from US$275.
Prices checked and include the ECU.
Your options for this car
New to this? Three ways to fit an aftermarket ECU explains each one in five minutes.
Dedicated plug-in 1
Built for this car. Goes where the factory ECU was and plugs straight into the factory loom.
From US$∞ →
Standalone + adapter harness 2
A general-purpose ECU with an off-the-shelf harness that joins it to the factory ECU plug.
From US$2,120 →
Wire-in ECU 55
Any ECU with the right features, on a new or rewired loom. Best for race cars, swaps and big changes from factory.
From US$275 plus loom →
Reflash
Keep the factory ECU and rewrite its tune. Usually the cheapest, keeps every factory feature, but limited to what the factory hardware can control.
Reflash options for this car are still being checked.
Plug-in ECUs for the Subaru Legacy / Liberty
3 options, cheapest first. Each one links to its full specs and sellers.
HT-150941 Elite 1500 + Subaru WRX MY93-96 & Liberty RS Plug 'n' Play Adaptor Harness Kit
Manual only
HT-151356 Elite 2500 + Subaru Liberty/Legacy Gen 4 3.0R & GT Plug 'n' Play Adaptor Harness Kit
Gen 4, MY04/05
Subaru Impreza 1992 to 2005 – Direct Fit ECU (S7)
Board fits inside OEM ECU case; Legacy GTB not a separate Magnus variation
No plug-in is listed for that chassis and year. A wire-in ECU below will still fit with a custom loom.
Wire-in ECUs that can run this engine
Cheapest current unit from each brand with at least 6 injector and ignition outputs, so it runs fully sequential.
Add a loom: built by your tuner or a loom maker. Filter every wire-in ECU by features and price
Find a tuner for these ECUs
Shops with their own dyno that tune the brands above.
About the makers: Haltech · Syvecs