2010-2012 Subaru Legacy GT EJ255 JDM Engine | 2.5L 4-Cylinder DOHC Dual AVCS Turbo Motor

Vehicle Specifications

• Engine Code: EJ255 (Legacy GT Specific)

• Displacement: 2.5 Liters

• Configuration: Horizontally Opposed (Boxer) 4-Cylinder

• Valvetrain: DOHC 16-Valve Dual AVCS

• Aspiration: Low-Mount Twin-Scroll Turbocharger

• Horsepower: 265 hp @ 5,600 rpm

• Torque: 258 lb-ft @ 2,000–5,200 rpm

• Block: Semi-Closed Deck Aluminum

Vehicle Fitments

This JDM EJ255 long block is designed specifically for the following North American (USDM) models:

• 2010 Subaru Legacy GT 

• 2011 Subaru Legacy GT 

• 2012 Subaru Legacy GT 

Important Fitment Note: This engine is unique to the 2010–2012 Legacy GT chassis where the turbocharger is mounted below the front of the engine. It is not a direct fit for the 2005–2009 Legacy GT or the 2008–2014 WRX without significant modification.

Installation & Technical Notes

The 5th Gen Legacy GT engine setup is highly specific. To ensure a successful installation and maintain your warranty, please follow these technical guidelines:

• Long Block Conversion: This sale includes the engine block, cylinder heads, and internal components. You must transfer your original USDM intake manifold, low-mount turbocharger assembly, oil pan, and engine wiring harness to ensure 100% compatibility with your vehicle's ECU.

• Oil System Priming: Before the first startup, the engine must be primed with oil. Disable the ignition/fuel system and crank the engine in 10-second intervals until the oil pressure light disappears to protect the turbocharger bearings.

• AVCS Solenoids: We recommend cleaning or replacing the AVCS oil feed filters (located in the banjo bolts) to ensure proper cam timing and prevent "check engine" codes for camshaft position.

• Essential Maintenance: We strongly recommend replacing the following parts during the swap:

  • Timing Belt Kit: Replace the belt, water pump, and all idler pulleys (Interference Engine).

  • Spark Plugs: NGK Laser Platinum or Iridium (SILFR6A).

  • Rear Main Seal: High-quality OEM Subaru seal to prevent future leaks.

  • Engine Oil: 5W-30 or 5W-40 Full Synthetic oil.

  • Coolant: Subaru Super Blue Long Life Coolant.

• ECU Reset: After installation, use a professional scan tool to clear "Learned Values" so the ECU can calibrate to the new engine’s compression and flow characteristics.