Engine Specifications
| Specification |
Details |
| Engine Code (Part Code) |
FB25 (FB25B / FB25D) |
| Engine Family |
Subaru FB Boxer Engine Series |
| Engine Size |
2.5L (2,498 cc) Horizontally Opposed 4-Cylinder (Boxer) |
| Aspiration & Fuel |
Multi-Point Injection (FB25B) / Direct Injection (FB25D) |
| Mileage / Condition |
Used Low-Mileage Import / Tested (Approx. 50,000–70,000 KM) |
| Testing Status |
Compression Tested, Leak-Down Tested & Steam Cleaned |
| Parts Included |
Complete Engine Assembly with Attached Core Accessories |
| Core Charge |
$0 (No Core Return Required) |
Product Overview & Fitment Highlights
Restore efficient, smooth power to your Subaru with a hand-picked, low-mileage FB25 complete engine assembly—compression tested, steam cleaned, and verified for strong mechanical health.
Why Choose This Engine?
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Low-Mileage Condition: Sourced with low average kilometers (approx. 50K–70K KM) to ensure maximum remaining operational life.
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Fully Tested: Units undergo compression and leak-down testing prior to listing to check cylinder pressures.
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Direct OEM Replacement: Original Subaru 2.5L FB-series Boxer engine assembly designed for direct drop-in setup.
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No Core Return: Keep your old engine block! We do not charge core fees or require trade-ins.
General Vehicle Fitment Reference
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Engine Variations:
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FB25B (MPi / Port Injected): Multi-Point Injection / Dual AVCS (Fits 2011–2018 Forester 2.5L, 2013–2019 Outback 2.5L, 2013–2019 Legacy 2.5L).
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FB25D (GDI / Direct Injected): Direct Injection with higher compression ratio (Fits 2019+ Forester, 2020+ Outback, 2020+ Legacy, 2021+ Crosstrek 2.5L).
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VIN & Variant Verification Recommended: Port-Injected (FB25B) and Direct-Injected (FB25D) engines use completely different cylinder heads, high-pressure fuel pumps, intake manifolds, and wiring harnesses and are not interchangeable. Call us at 403.471.7150 or send us your VIN so we can confirm exact matching before shipping!
Components Included vs. Accessories to Transfer
Engines are sold as complete assemblies (photos may show a representative unit) , including attached intake and exhaust core accessories. However, because electrical plug configurations, emissions setups, and sensor layouts vary by year and market, plan to swap your original sensors and harness if necessary:
| Included (Attached Core Accessories) |
Transfer / Swap From Original Engine |
| Engine Block & Cylinder Head Assembly |
Vehicle Engine Wiring Harness & ECU
|
| Intake Manifold & Throttle Body Assembly |
Sensors (USDM Crank/Cam Sensors, Knock Sensor)
|
| Fuel Rail & Injectors (HPFP included on FB25D) |
Vehicle Emissions & Vacuum Lines |
| Exhaust Headers, Valve Covers & Timing Cover |
Alternator, AC Compressor & Power Steering Pump (If different)
|
| Oil Pan & Internal Oil Pump |
Starter Motor |
Compatible Models & Years
| Model |
Year Range |
Drivetrain |
Notes |
| Subaru Forester |
2011 – 2024 |
AWD |
FB25 (2.5L) |
| Subaru Outback |
2013 – 2024 |
AWD |
FB25 (2.5L) |
| Subaru Legacy |
2013 – 2024 |
AWD |
FB25 (2.5L) |
| Subaru Crosstrek |
2021 – 2024 |
AWD |
FB25 (2.5L trims) |
Unsure About Compatibility?
Vehicle options, trims, and engine splits can vary. Before placing your order, please contact us with your VIN (Vehicle Identification Number) or send it to us before ordering. Our team will verify exact block, head, and sensor compatibility for your specific vehicle.
Installation & Peripheral Swap Notice:
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Sensor & Harness Swaps: Depending on your vehicle’s exact market, trim, and emission specs, your installer may need to transfer your original engine’s sensors, intake manifold, wiring harness, or oil pan to match your factory ECU.
Disclaimer: This compatibility table is provided for reference purposes only. It is the buyer/installer’s responsibility to confirm that the engine code listed in the specifications above matches their existing vehicle setup prior to installation.
