The Legacy GT EJ255 is one of the most capable turbocharged daily-driver platforms Subaru ever built, and proper standalone ECU management shows exactly why.
The Subaru Legacy GT EJ255 runs a boxer engine with genuine tuning potential, and the factory ECU is the limiting factor in reaching it. The Tuned By Shawn PNP Wiring Harness Kit for the Haltech Nexus connects directly to your factory harness without any permanent modifications, giving the Haltech Nexus full standalone engine control. No cutting, no splicing, fully reversible.
Advantages
- Boost delivery that's precise and repeatable instead of factory ECU conservative
- Throttle response that's direct and proportional to your inputs
- Flat-four character that comes through clearly when the tune is built for the actual engine
- Fueling that stays accurate at temperature, not chasing a moving target
- A tune that reflects your modifications instead of compensating for them
Features
- Plug-and-play fitment for 2005-2006 Subaru Legacy GT EJ255, manual transmission
- Compatible with Haltech Nexus R3, R5, S2, and S3 ECUs
- No cutting or splicing of factory wiring
- OEM-quality connectors, USA-built by Boomslang Fabrication
- Fully reversible, factory harness preserved
- For competition and off-road use
The Details
Built specifically for this vehicle's connector layout with OEM-spec connectors and correct wire gauge throughout. Your factory harness stays completely untouched and the car can return to stock at any time. The Haltech Nexus takes full engine control once installed, giving your tuner a clean vehicle-specific foundation to build a proper map from.
Kit Includes
- 1x Boomslang PNP wiring harness for 2005-2006 Subaru Legacy GT EJ255
- Haltech Nexus ECU sold separately
Fitment
2005-2006 Subaru Legacy GT, Manual Transmission.