The EJ255 is Subaru's 2.5-liter turbocharged engine, and it powers several mid-2000s models such as the Impreza WRX, Forester XT, Legacy GT, and Outback XT. The high-performance STI uses a different code, EJ257.
As part of Subaru's EJ engine family, the EJ255 was used primarily in turbocharged variants during the mid-2000s across multiple body styles and markets. It’s most commonly found in performance-oriented trims from that era, with some regional variations in exact year ranges and availability. Below is a breakdown of the main models that commonly came with the EJ255, followed by notes on identification and common considerations.
Models that used the EJ255 engine
Below are the best-known Subaru models that were equipped with the EJ255 turbo 2.5L engine, along with approximate years for US-market examples.
- Impreza WRX (roughly 2004–2007 in the United States; available in other markets with similar years)
- Forester XT (approximately 2004–2008)
- Legacy GT (approximately 2005–2009)
- Outback XT (approximately 2005–2009)
Notes: The EJ255 is distinct from the EJ257 engine code used in the high-performance Subaru WRX STI. If you’re buying a used vehicle, check the engine code on the engine cover or under the hood to confirm it is EJ255 rather than EJ257.
Technical overview and identification
Understanding what the EJ255 is helps when shopping for used Subarus or verifying a vehicle’s specifications. The EJ255 is a turbocharged version of Subaru’s 2.5-liter flat-four, designed for higher output and responsive performance in turbo trims.
Key characteristics
- Configuration: horizontally opposed (boxer) 4-cylinder, 2.5 liters
- Induction: turbocharged with intercooling in the turbocharged trims
- Head design: dual overhead camshafts (DOHC) common to EJ-family variants
- Typical output: broadly in the range of 230–265 horsepower depending on year and market, with torque figures also varying by tuning and market regulations
Identifying the EJ255 vs other EJ engines
To confirm an engine is EJ255 (as opposed to EJ205, EJ251, or EJ257), check these indicators:
- Engine code stamp: look for “EJ255” on the engine block or near the valve cover; it is usually visible after removing components or peeking through service panels.
- Vehicle badge and documentation: model trims labeled WRX, XT, or GT from the mid-2000s are strong indicators of a turbo 2.5L engine; STI models carry EJ257 instead.
- Flavor of turbo system: EJ255-powered trims typically use a single turbo setup appropriate for WRX/XT/GT lines, while STI uses the more performance-oriented EJ257 platform.
Common maintenance considerations for EJ255-powered Subarus include monitoring for turbo-related wear, ensuring proper cooling and oil management, and addressing any aging head gasket concerns that can appear on older EJ-series engines. As with any used car, a thorough inspection and service history review are recommended.
Summary
The EJ255 engine was Subaru’s 2.5-liter turbo option used in several mid-2000s models, with the most common applications being the Impreza WRX, Forester XT, Legacy GT, and Outback XT. The STI used EJ257, not EJ255. If you’re evaluating a used Subaru from that era, verify the engine code to confirm EJ255, and review maintenance history and any turbo-related wear to assess long-term reliability.