Subaru 2.5L Boxer (FB25/EJ25)

Subaru 2.5L Boxer (FB25/EJ25) — every model and year that used this engine (8 models, 2010–present), based on NHTSA VIN build data, with links to prices and reliability.

Outback, Forester, Legacy flat-four.

2.5L · 4 cylinders · seen in 8 models, 2010–2027

By the numbers

Output range 162–310 hp (median 182 hp). Gasoline: 100%. Based on 734 decoded NHTSA VIN build sheets.

About this engine family

The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. Introduced in 1989, they were intended to succeed the previous Subaru EA engine. The EJ series was the mainstay of Subaru's engine line, with all engines of this series being 16-valve horizontal flat-fours, with configurations available for single, or double-overhead camshaft arrangements. Naturally aspirated and turbocharged versions are available, ranging from 94 to 341 hp.

These engines are commonly used in light aircraft, kit cars and engine swaps into air-cooled Volkswagens, and are also popular as a swap into Volkswagen T3/Vanagons powered by the Volkswagen Wasserboxer engine. Primary engineering on the EJ series was done by Masayuki Kodama, Takemasa Yamada and Shuji Sawafuji of Fuji Heavy Industries, Subaru's parent company.

In detail

Usage: Impreza GC1 series (JDM) — Replaced by Subaru EL engine in 2006 GD, GG, GE & GH series (JDM) Impreza. Impreza 93–06 (Latin America) Displacement: Bore: Stroke: Compression Ratio: 9.4:1 – 10.0 Valvetrain: SOHC, 16 valves Fuel Delivery multi point fuel injection EJ151 Horsepower: at 6000 rpm Torque: at 3600 rpm EJ152 Horsepower: at 5600 rpm Torque: at 4000 rpm EJ153 Horsepower: at 5200 rpm Torque: at 3600 rpm EJ154 Horsepower: at 5200 rpm Torque: at 4000 rpm Usage: Impreza 93–94 (JDM only) GC4 series Impreza 93–06 (Europe & Middle East) Impreza 93–97 (Australia) Impreza 93–06 (Latin America) Displacement: Bore: Stroke: Compression Ratio: 9.4:1 – 10.0:1 Valvetrain: SOHC Belt drive Fuel Delivery mpfi (carburetor in some locations) EJ16 Horsepower: at 6000 rpm Torque: at 4500 rpm Usage: Impreza 93–99 GC6 series Legacy (except USA) 90–96 BC2, BC3, BD2, BD3, BG3 series Isuzu Aska (1990–1993) Displacement: Bore: Stroke: Compression Ratio: 9.5:1 – 9.7:1 Valvetrain: SOHC Fuel Delivery Carburetor + Distributor (mainly for Latin American and Asian markets) and single point fuel injection EJ181 Horsepower: at 6000 rpm Torque: at 3200 rpm EJ182 Horsepower: at 6000 rpm Torque: at 4500 rpm EJ183 Horsepower: at 5600 rpm Torque: at 3600 rpm At the 46th Tokyo Motor Show in October 2019, Subaru announced it would conclude production of the EJ20 by the end of March 2020.

At that time, the EJ20 was only being sold in the Japanese domestic market for the WRX STI, and a special "WRX STI EJ20 Final Edition" with a balanced version of the engine was sold to commemorate the end of EJ20 production. EJ20E SOHC naturally aspirated Legacy JDM 1989–1994 BC — BF series 1993–1999 BD — BG series( ECU code EURO, D3; Asia 4H) 1998–2004 BE — BH series( ECU code EURO, D3; Asia 4H) 2003–2009 BL — BP series Europe 1991–1999 BC, BD, BF series Impreza JDM 1993–1999 GC — GF series 2008–current GH — GE series Europe 1994–1999 GC, GF series Isuzu Aska (1990–1993) 1990–1993 EJ201 SOHC naturally aspirated Bore: Stroke: MAP sensor Forester (Europe) SF and SG Series (pre-facelift) 2002–2005 GD/GG Impreza 2000–2005 GC/GF Impreza BE/BH Legacy EJ20D DOHC naturally aspirated Legacy JDM 1989–1999 BC — BF and BD — BG series EJ202 SOHC naturally aspirated Forester JDM SF series, 138 PS (1997 – 2002) Forester JDM SG series, 137 PS (2004, perhaps 2003–2005), e.g.

EJ202DXSAE x20 EJ203 SOHC naturally aspirated Forester JDM SG series, 140 PS (2003 – 2008) Legacy JDM 2.0i BP/BL series, 140 PS (2003 – 2009) EJ204 DOHC naturally aspirated AVCS Legacy B4 TSR JDM BE — BH series 1999–2001 Legacy JDM BL — BP series 2003–2009 Legacy (Europe) BL — BP series 2003–2007 Impreza JDM GC — GF series 1993–1999 Impreza GE — GH series 2007–2011 Forester (Europe) SG Series 2005–2007 Forester JDM SH Series 2008–2011 Exiga JDM YA Series 2008–2012 Legacy European and S.

African Markets BM BR Series 2009–2014 EJ20C runs on compressed natural gas All engines listed below were installed with a turbocharger and an intercooler: Is not actually a valid code from Subaru, but is mostly used by enthusiasts and mechanics to describe the entire line of turbocharged engines that have been available over time. The practice began with the designation of the USA-spec turbo, commonly referred to as the EJ22T, and the habit of referring to any turbocharged engine as a "T" began.

When referring to the EJ20T, one is speaking of one of the following: Legacy RS 89–93 Legacy RS-RA 89–93 Legacy GT 89–93 Power output ranges from at 6000 rpm and for the GT to at 6400 rpm and for the RS versions. Engines can be identified by coil on plug, and with 2 M6 bolts per coil and valve covers with 4CAM 16VALVE and horizontal lines above and below the plug holes. All these engines have the air-to-water intercooler setup (chargecooler) and close deck blocks equipped with piston oil squirters.

Impreza WRX 92~96.

Source: Wikipedia — Subaru EJ engine, CC BY-SA.

Models that used this engine

Model Years with this engine Fuel VIN builds seen
FORESTER 2011–2026 Gasoline 240
OUTBACK 2010–2026 Gasoline 208
LEGACY 2010–2025 Gasoline 157
CROSSTREK 2021–2027 Gasoline 69
WRX 2015–2021 Gasoline 47

Engine usage derived from NHTSA VIN build data (displacement + cylinder configuration). Model links lead to prices, generations and reliability.

For sale with this engine