Subaru Impreza WRX STI 2008–2014 2.5L Turbo Engine – JDM EJ257 Motor – Compression Tested – 30 Day Warranty

Looking for a reliable replacement engine for your STI? J-Spec Auto Sports proudly offers the Subaru Impreza WRX STI 2008–2014 2.5L Turbo EJ257 JDM engine, professionally compression tested and backed by a 30-day warranty.

This is the legendary turbocharged EJ257 platform — the heart of the GRB and GVF STI models — known for its power potential, strong block design, and performance tuning capability.

If your STI is suffering from rod knock, spun bearing, ringland failure, or high-mileage wear, this EJ257 motor is the correct factory turbo replacement.

Engine Specifications

• Engine Code: EJ257

• Displacement: 2.5L Turbocharged

• Configuration: DOHC Flat-4 Boxer

• AVCS: Dual AVCS

• Fuel Type: Gasoline

• Condition: Used JDM Motor

• Compression Tested: Yes

• Warranty: 30-Day Startup Warranty

This engine is compression tested prior to sale to ensure internal health and proper cylinder performance.

Compatible Vehicles

Direct Fit For:

• 2008 Subaru Impreza WRX STI

• 2009 Subaru Impreza WRX STI

• 2010 Subaru Impreza WRX STI

• 2011 Subaru Impreza WRX STI

• 2012 Subaru Impreza WRX STI

• 2013 Subaru Impreza WRX STI

• 2014 Subaru Impreza WRX STI

Fits:

• GRB STI Hatchback

• GVF STI Sedan

Always verify compatibility before installation.

Why Choose the EJ257?

The EJ257 is Subaru’s flagship 2.5L turbo performance engine, delivering:

✔ Strong factory turbo power
✔ Forged crankshaft design
✔ Excellent tuning support
✔ Proven track and street reliability
✔ Massive aftermarket upgrade potential

This engine platform is capable of handling upgraded turbos, fueling systems, and bolt-on modifications when properly tuned.

Compression Tested for Peace of Mind

Unlike many sellers who offer untested engines, J-Spec Auto Sports compression tests every EJ257 before listing.

This ensures:

• Even cylinder compression

• No major internal damage

• Reliable startup condition

• Confidence before installation

We believe in transparency and quality.

30-Day Warranty Protection

Your purchase is backed by a 30-day startup warranty, providing peace of mind during installation and initial break-in.

We stand behind the engines we sell.

Ideal For:

• Blown engine replacement

• Rod knock repair

• Ringland failure replacement

• High-mileage STI refresh

• Performance build starting point

• Daily-driven STI restoration

Whether you’re rebuilding a stock STI or planning future upgrades, the EJ257 is the correct foundation.

What’s Included

Engine is sold as a long block assembly. Depending on availability, it may include:

• Intake manifold

• Turbocharger

• Fuel rails

• Sensors

• Coil packs

Exact accessories may vary. Contact us for details on the current stock unit.

Why Buy From J-Spec Auto Sports?

J-Spec Auto Sports specializes in:

• JDM Subaru turbo engines

• STI 6-speed transmissions

• Complete front clips

• Performance Subaru parts

• Rare JDM components

We understand the EJ platform and properly inspect engines before shipment.

Our reputation is built on supplying quality Subaru powertrains with honest descriptions and reliable support.

Nationwide Shipping Available

All engines are securely palletized and shipped via freight carrier across the United States.

Local pickup may also be available.

See more EJ255 STI motors:  https://jspecauto.com/product-category/engines/?_product_brand=subaru&_engine_sub_category=ej255-ej257-2-5l-engines-for-wrx-and-wrx-sti&_available=1