Subaru EJ25 Turbo Engine for Sale

About the Subaru EJ25 Turbo Engine

The Subaru EJ25 Turbo is one of the most glorious powertrain creations Subaru has built. With a displacement of 2.5 liters and a turbocharger that adds significant force, it's capable of up to 305 horsepower and 290 lb-ft of torque in STI tune. It features tuning potential that goes well beyond stock with proper supporting modifications and a strong aftermarket community. This is why so many Subaru enthusiasts prefer the EJ25 Turbo for performance applications, linear power delivery, and instant throttle response.

From carving through mountain twisties to dominating the racetrack, this Subaru EJ25 Turbo engine for sale here is the ultimate power plant for your Subaru.

Engine Overview: Subaru EJ25 Turbo (Both EJ255 and EJ257 Covered)

The Subaru EJ25 Turbo offers serious power potential combined with daily-driver tractability. Equipped with an intercooled turbocharger system, drivers of EJ25 Turbo Subarus feel a surge of acceleration with instant throttle response and great low-end torque. Combined with reinforced internals (especially on the EJ257 STI variant with forged connecting rods), this engine has remained a favorite among tuners and racers for nearly two decades.

This page covers both turbocharged 2.5L EJ25 variants:

EJ255 , The WRX, Forester XT, and Legacy GT Engine

• HP: 227 HP early (2006-2008 WRX) to 255 HP (later WRX 2009-2014, Forester XT, Legacy GT)
• Torque: 235-244 lb-ft at 4,000 RPM
• Turbocharger: IHI VF52 (or similar VF-series, varies by application)
• Connecting Rods: Cast
• Common Applications: Subaru WRX (2006-2014), Forester XT (2004-2013), Legacy GT (2005-2012), Outback XT (2005-2009)
• Fuel: Premium 91 octane required

EJ257 , The WRX STI Flagship Engine

• HP: 300-305 HP at 6,000 RPM
• Torque: 290 lb-ft at 4,000 RPM
• Turbocharger: IHI VF48 (or similar VF-series, varies by year)
• Connecting Rods: Forged (stronger than EJ255 cast rods)
• More Aggressive Cams: Compared to EJ255
• Common Applications: Subaru WRX STI (2004-2021, all 3 US generations)
• Fuel: Premium 93 octane recommended

EJ255 vs EJ257 Comparison

For higher power applications beyond stock block limits, the Cosworth EJ257 performance build (closed-deck block, full forged internals) is the recommended foundation.

Vehicle Applications

EJ255 Applications:

EJ257 Applications:

Key Engineering Features

• Flat-4 Horizontally Opposed Boxer Configuration: Subaru signature architecture, lower center of gravity than inline-4
• DOHC Per Bank: Dual overhead camshafts per cylinder bank, 16 valves total
• AVCS Variable Valve Timing: Active Valve Control System on BOTH intake AND exhaust camshafts (a major improvement over the older EJ205 turbo which had AVCS on intake only)
• IHI VF-Series Turbocharger: Quality Japanese turbocharger, water-cooled bearing housing on most variants
• Intercooled: Top-mount intercooler (TMIC) on WRX/STI/Forester XT (mounted on top of engine), side-mount intercooler (SMIC) on Legacy GT
• Open-Deck Aluminum Block: Lightweight but with documented limitations at high boost
• Forged Connecting Rods (EJ257): STI-specific rods stronger than EJ255 cast rods
• Premium Fuel Required: 91 octane minimum, 93 recommended for full power

Common EJ25 Turbo Service Items (Honest Disclosure)

The EJ25 Turbo engines have well-documented service items that potential buyers must understand:

Ringland Failures (Critical)

• The most well-known EJ25 Turbo weakness. Cast pistons can develop ringland failures (the lands between piston rings crack), causing loss of compression and engine failure. Risk factors:
• High boost levels (over 18-20 PSI on stock pistons)
• Detonation (low octane fuel, poor tuning, lean conditions)
• Lean air/fuel ratios especially under boost

Modified engines without supporting upgrades

• Mitigation: Use premium fuel always (93 octane recommended), avoid detonation, proper tuning if modified, conservative boost levels on stock pistons, forged pistons for any serious build.

Connecting Rod Bearing Wear

At high mileage (100,000+ miles), rod bearing wear becomes documented , especially on cast-rod EJ255 variants. Symptoms: rod knock at startup or under load. Service: complete bottom-end rebuild ($2,500-5,000) or engine replacement.

Head Gasket Failures

Less common than NA EJ25 (closed-deck not a factor here since both are open-deck) but documented at high mileage with aggressive use. Open-deck block design contributes. MLS gaskets at any installation.

AVCS Solenoid Failures

At 80,000-120,000 miles, AVCS solenoids can develop failures producing check engine codes and reduced upper-RPM power. Service: replace AVCS solenoid ($150-300 part).

Turbocharger Service Items

• Oil seal leaks: Producing blue smoke
• Bearing wear: Producing turbo whine
• Shaft play: Indicates imminent failure
• Service interval: Often turbo rebuild or replacement needed at 100,000-150,000 miles

Other Items

• Banjo bolt screen blockage: Common cause of turbo oil starvation
• Front main seal leaks: At high mileage
• Spark plug service: 30,000 mile intervals on STI, 60,000 on WRX

Why Choose a Used Subaru EJ25 Turbo Engine?

• Cost savings vs reman ($1,999 used vs $3,500-5,500 reman plus core)
• Direct OEM fit for WRX, Forester XT, Legacy GT, Outback XT, WRX STI applications
• Variant matching , we identify EJ255 vs EJ257 for your application
• AWD compatibility , direct mate for Subaru's symmetrical AWD
• Strong aftermarket , extensive performance parts catalog
• Tuning potential , 350-450 HP achievable with proper modifications on stock block

For serious 450+ HP builds, consider the Cosworth EJ257 performance variant (closed-deck block, full forged internals) , see our separate Cosworth EJ257 listing.

Here at Vaz Auto Solutions, you'll find this Subaru EJ25 Turbo engine for sale at the most reasonable price possible, with variant verified, donor vehicle confirmed, all 4 cylinders compression tested, turbocharger condition verified, AVCS function tested on both intake AND exhaust, ringland condition assessed (critical), connecting rod bearing wear inspected, and complete inspection.

Vehicle Compatibility

Direct Fit:

Condition and Inspection

• Variant verified (EJ255 for WRX / Forester XT / Legacy GT, or EJ257 for WRX STI)
• Donor vehicle confirmed (WRX, Forester XT, Legacy GT, Outback XT, or WRX STI)
• All 4 cylinders compression tested
• Oil pressure verified at idle and operating speed
• Turbocharger condition verified (shaft play, oil seals, bearing condition, wastegate function)

Wastegate operation tested

• AVCS variable valve timing function verified (intake AND exhaust camshafts , both must function)
• Ringland condition assessed (the critical EJ25 turbo service item, especially with high-boost history)
• Connecting rod bearing wear assessed (documented high-mileage service item)
• Head gasket condition verified (open-deck block service area)
• Open-deck aluminum block condition inspected
• Cylinder head condition assessed (aluminum heads, warping check)
• Forged connecting rods verified (EJ257 STI variant)
• Banjo bolt screen condition checked (turbo oil supply)
• AVCS solenoid function verified
• Spark plug condition documented (4 NGK iridium plugs)
• Coil-on-plug function verified
• Coolant system function verified
• Intercooler condition assessed (top-mount or side-mount)
• Miles from donor vehicle documented where available
• Variant correctly identified (EJ255 vs EJ257)
• All 4 cylinders compression tested
• Turbocharger condition verified (including shaft play)
• AVCS variable valve timing tested on both intake AND exhaust
• Ringland condition assessed (the critical EJ25 turbo service item)
• Connecting rod bearing wear inspected
• Head gasket condition verified
• Open-deck block inspection
• Donor vehicle and mileage documented

Cross-reference assistance across WRX / Forester XT / Legacy GT / Outback XT / WRX STI applications

• WRX / STI tuning consultation
• Performance modification guidance
• Free freight pallet delivery to all 50 states
• 15 day replacement warranty on internal defects
• Subaru EJ25 Turbo specialist support team