What is ej257?

The EJ257 is a turbocharged, 2.5-liter four-cylinder boxer engine produced by Subaru. It is most commonly found in the Subaru Impreza WRX STI and was first introduced in 2004. The EJ257 engine is known for its performance capabilities, with turbocharged versions of the engine producing upwards of 300 horsepower and 300 lb-ft of torque in stock form.

The EJ257 features a dual overhead camshaft design with four valves per cylinder, as well as a closed-deck block and forged pistons for increased strength and durability. The engine also utilizes a top-mounted intercooler for improved cooling and performance.

Despite its performance capabilities, the EJ257 engine has been known to have some reliability issues, particularly in regards to the stock piston ring design which can lead to ringland failure under high load conditions. However, many enthusiasts have addressed these issues through aftermarket upgrades and modifications.

Overall, the EJ257 engine is a popular choice for enthusiasts looking to boost the performance of their Subaru vehicles, thanks to its potent power output and robust design features.