The SUBARU EJ20 Final Edition is a 1,994 cc, flat — four turbocharged petrol engine produced between 2019 and 2021. It features DOHC, 16 — valve configuration with AVCS (Active Valve Control System) on both intake and exhaust cams, delivering 213 kW (290 PS) and 370 Nm of torque in JDM STI applications. Its horizontally opposed layout provides low center of gravity and balanced performance across high — performance platforms.
Fitted exclusively to the WRX STI EJ20 Final Edi…
Production years 2019–2021 meet Euro 5 emissions standards depending on market (VCA UK Type Approval #VCA/EMS/3481).
The SUBARU EJ20 Final Edition is a 1,994 cc flat-four turbocharged petrol engine engineered for high-performance applications (2019–2021). It combines Subaru's signature boxer layout with DOHC valvetrain and dual AVCS technology to deliver refined power delivery and mechanical balance. Designed to meet evolving emissions standards, it balances track capability with road legality as the final evolution of the EJ-series.
| Parameter | Value | Source |
|---|---|---|
Displacement | 1,994 cc | |
Fuel type | Petrol | |
Configuration | Flat-4, DOHC, 16-valve | |
Aspiration | Turbocharged | |
Bore × stroke | 86.0 mm × 86.0 mm | |
Power output | 213 kW (290 PS) @ 6,400 rpm | |
Torque | 370 Nm @ 3,200–5,200 rpm | |
Fuel system | Multi-point fuel injection (MPFI) with dual AVCS | |
Emissions standard | Euro 5 (market-dependent) | |
Compression ratio | 8.2:1 | |
Cooling system | Water-cooled | |
Turbocharger | IHI VF34 ball-bearing turbo | |
Timing system | Double-row timing chain | |
Oil type | SAE 5W-30 (API SN) | |
Dry weight | 134 kg |
The SUBARU EJ20 Final Edition was used exclusively in the WRX STI EJ20 Final Edition platform with longitudinal mounting. This engine received no platform adaptations and was produced as a limited-run send-off before replacement by the FA24-powered WRX. All units were hand-assembled at the Yuzuoka Plant with serialized plaques, creating strict interchange limits. All adaptations are documented in OEM technical bulletins.
The EJ20 Final Edition's primary reliability risk is head gasket degradation, with elevated incidence in mixed driving conditions. Internal Subaru quality reports from 2019 indicated a significant number of pre-upgrade heads requiring replacement before 100,000 km, while UK DVSA records show coolant-related failures were common in neglected examples. Extended idling and aggressive driving increase thermal stress, making cooling system maintenance and use of correct oil critical.
Analysis derived from Subaru technical bulletins (2019–2021) and UK DVSA failure statistics (2022–2025). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The EJ20 Final Edition offers durable performance and solid engineering, but all builds are susceptible to head gasket failure under extreme conditions. Later revisions with improved MLS gaskets significantly improve durability. Regular oil changes, use of correct coolant (HOAT), and prompt attention to overheating are essential for reliability.
Key issues include head gasket failure, cooling system failures (thermostat, water pump), camshaft/lifter wear, and oil leaks from valve cover and rear main seal. These are documented in Subaru service bulletins and require OEM-specified parts for proper repair.
The EJ20 Final Edition was used exclusively in the WRX STI EJ20 Final Edition (2019–2021). It was replaced by the FA24 in 2022 with larger displacement and updated engine management. No cross-manufacturer applications are documented for this variant.
Yes. The turbocharged DOHC design responds well to tuning. Stage 1 ECU remaps can gain ~30–50 kW safely, leveraging the robust IHI turbo architecture. Upgraded turbo, intercooler, and fuel system allow further gains. Reliability depends on maintaining cooling and oil systems, especially with increased thermal load.
In a WRX STI EJ20 Final Edition, combined consumption is ~11.8 L/100km (24 mpg UK). City driving may see 13–14 L/100km (22–20 mpg), while highway cruising can achieve ~9.5 L/100km (30 mpg). Real-world figures depend on driving style and vehicle condition.
Yes. The EJ20 Final Edition series is an interference engine. If the timing chain fails or jumps, pistons will contact open valves, causing catastrophic internal damage. Chain maintenance and tensioner inspection are critical, especially given the engine's high-RPM operation.
Subaru specifies SAE 5W-30 synthetic oil meeting API SN spec. Change intervals should not exceed 15,000 km. Proper oil ensures adequate protection for camshafts, lifters, and the timing chain, especially under sustained high-RPM use.
Comprehensive technical documentation and regulatory references
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SUBARU Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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