Here is a FAQ I wrote for the second gen Legacy, but the info crosses over to your Impreza as well.
Here is a list of non-turbo engines that can be fitted to any BD, BG, or BK Legacy. If an older non-OBDII engine is used, some modifications must be made for OBDII sensors.
EJ15 Used in Impreza GC1 series
Specifications
- Displacement: 1493 cc
- Bore: 85.0 mm
- Stroke: 65.8 mm
- Compression Ratio: 9.4:1 - 10.0
- Valvetrain: SOHC
- Fuel Delivery multi point fuel injection
EJ151
Horsepower: 97 PS (71 kW; 96 bhp) @ 6000 rpm
Torque: 129.4 N·m (95 lb·ft) @ 3600 rpm
EJ152
Horsepower: 102 PS (75 kW; 101 bhp) @ 5600 rpm
Torque: 136.3 N·m (101 lb·ft) @ 4000 rpm
EJ153
Horsepower: 95 PS (70 kW; 94 bhp) @ 5200 rpm
Torque: 140.2 N·m (103 lb·ft) @ 3600 rpm
EJ154
Horsepower: 100 PS (74 kW; 99 bhp) @ 5200 rpm
Torque: 142.0 N·m (105 lb·ft) @ 4000 rpm
EJ16Usage:
Impreza 93-94 (JDM only) GC4 series
Impreza 93-06 (Europe & Middle East)
Impreza 93-97 (Australia)
Specifications
- Displacement: 1597 cc
- Bore: 87.9 mm
- Stroke: 65.8 mm
- Compression Ratio: 9.4:1 - 10.0:1
- Valvetrain: SOHC
- Fuel Delivery mpfi (carburetor in some locations)
Horsepower: 100 PS (74 kW; 99 bhp) @ 6000 rpm
Torque: 138.3 N·m (102 lb·ft) @ 4500 rpm
EJ18Usage:
Impreza 93-99 GC6 series
Legacy (except USA) 90-96 BC2, BC3, BD2, BD3, BG3 series
Isuzu Aska (1990–1993)
Specifications
- Displacement: 1820 cc
- Bore: 87.9 mm
- Stroke: 75.0 mm
- Compression Ratio: 9.5:1 - 9.7:1
- Valvetrain: SOHC
- Fuel Delivery: single point fuel injection
EJ181
Horsepower: 110 PS (81 kW; 108 bhp) @ 6000 rpm
Torque: 149.1 N·m (110 lb·ft) @ 3200 rpm
EJ182
Horsepower: 115 PS (85 kW; 113 bhp) @ 6000 rpm
Torque: 154.0 N·m (114 lb·ft) @ 4500 rpm
EJ183
Horsepower: 120 PS (88 kW; 118 bhp) @ 5600 rpm
Torque: 163.8 N·m (121 lb·ft) @ 3600 rpm
EJ20 Specifications
- Displacement: 1994 cc
- Bore: 92.0 mm
- Stroke: 75.0 mm
EJ20D DOHC 1989 - 1999 Legacy JDM
150 hp (110 kW) BC - BF and BD - BG series
EJ20E SOHC Legacy JDM
1989-1994 125 hp (93 kW) BC - BF series
1993-1999 135 hp (101 kW) BD - BG series
1998-2004 155 hp (116 kW) BE - BH series
2003-2009 140 hp (100 kW) BL - BP series
Impreza JDM
1993-1999 135 hp (101 kW) GC - GF series
2008-current 140 hp (100 kW) GH series
Isuzu Aska (1990–1993)
1989-1994 125 hp (93 kW)
EJ202 SOHC
2002 - 2008 Forester JDM SG series
EJ204 DOHC AVCS
Legacy JDM BL - BP series
2003-2009 190 hp (140 kW)
Impreza JDM GC - GF series
1993-1999 155 hp (116 kW)
EJ20N runs on compressed natural gas
EJ22Usage
- 1995 - 2001 Impreza
- 1990 - 1999 Legacy
- 1995 - 1999 Outback
SpecificationsDisplacement: 2212 cc
Bore: 96.9 mm
Stroke: 75.0 mm
Compression Ratio: 9.5:1 - 9.7:1
Valvetrain: SOHC
Fuel Delivery: multi-point fuel injection
EJ221Horsepower: 135 PS (99 kW; 133 bhp) @ 5800 rpm
Torque: 186.3 N·m (137 lb·ft) @ 4800 rpm
EJ222Horsepower: 142 bhp (106 kW; 144 PS) @ 5600 rpm
Torque: 149 lb·ft (202 N·m) @ 3600 rpm
EJ22E
Horesepower: 135bhp (101kW) @ 5800 rpm
Torque: 140 ft·lbf (190 N·m) @ 4800 rpm
EJ25
Usage
- 1998 Impreza
- 1998 Forester
- 1996 - 2004 Legacy
- 1996 - 1999 Outback
- 2000 - 2004 Impreza 2.5RS & 2.5TS
- 2002 - 2004 Impreza Outback Sport
- 2000 - 2004 Forester
- 2003 - 2005 Baja
Specifications
- Displacement: 2457 cc
- Bore: 99.5 mm
- Stroke: 79.0 mm
- Compression Ratio: 9.5:1 - 10.0:1
- Fuel Delivery: multi point fuel injection
EJ25D
1996:
Horsepower: 155hp (116kW) @ 5600 rpm
Torque: 140 ft·lbf (190 N·m) at 2800 rpm
1996 - 1999
Horsepower: 165 hp (123 kW) @ 5600 rpm
Torque: 162 ft·lbf (220 N·m) at 4000 rpm
EJ251
Horsepower: 165hp (123kW) @ 5600RPM
Torque: 167 ft·lbf (226 N·m) @ 4000RPM
EJ252
Horsepower: 156hp (115kW)
EJ253
Horsepower: 173 hp (129 kW) @ 5600 rpm
Torque: 166 ft·lbf (225 N·m) @ 4000 rpm
EJ254
Horsepower: 165 (2006+ is 175hp)
information from http://en.wikipedia.org/wiki/Subaru_EJ_engine
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