Fitments
| SUBARU |
| More Information |
Year |
Model |
SubModel |
Cylinders |
Liter |
Aspiration |
Eng Desg. |
Fuel |
Notes |
|
Click For More Info
|
2004 - 2007 |
FORESTER |
XT
XT LIMITED |
H4 |
2.5 |
T |
EJ255 |
GAS |
|
|
Click For More Info
|
2002 - 2007 |
IMPREZA |
WRX
WRX TR |
H4 |
2.0
2.5 |
T |
EJ205
EJ255 |
GAS |
|
|
Click For More Info
|
2004 - 2007 |
IMPREZA |
WRX STI
WRX STI LIMITED |
H4 |
2.5 |
T |
EJ257 |
GAS |
|
|
Click For More Info
|
2004 - 2007 |
LEGACY |
BASE
GT
GT LIMITED
GT SPEC.B |
H4 |
2.5 |
T |
EJ255 |
GAS |
|
|
Click For More Info
|
2004 - 2007 |
OUTBACK |
BASE
XT
XT LIMITED |
H4 |
2.5 |
T |
EJ255 |
ALL |
|
Product Description
COBB Tuning offers a solution for customer craving more power.
The term Short Block refers to the cylinder block itself, without cylinder heads, water or oil pumps, or any accessories located outside of the cylinder block.
COBB Tuning Tuner Series Short Blocks are SOLD FULLY ASSEMBLED. NO CORE CHARGE REQUIRED!
TUNER SERIES STAGE 1
Recommended up to 400-450HP.
If you’re looking to replace your STI engine but want something better than stock, this may be the shortblock for you. Our new Tuner Series shortblocks are built using our extensive knowledge of Subaru engines through our motorsports heritage at an affordable price.
Please note when ordering we need to know specifically which cylinder head you will be using.
Our Stage 1 Tuner Series shortblock consists of a carefully chosen set of components engineered to be used together.
FEATURES:
- Brand-new EJ25 “STI” Semi-closed Block (2.5L Displacement)
- STI Forged Steel Connecting Rods
- Forged Aluminum “3D Chamber Matched” Pistons (8.5:1 CR, customizable)
- Heavy-Duty Chromoly Piston Pins
- Low Friction Piston Rings
- STI Forged Chromoly Crankshaft (79mm Stroke)
TUNER SERIES STAGE 2
Recommended up to 450-500HP.
For those that need a little more than our Stage 1, we are proud to offer the Stage 2 Tuner series short block. In addition to our Stage 1 Tuner series engine, the Stage 2 features higher strength billet steel connecting rods instead of STI units. The longer rod design helps improve torque, while being significantly stronger than the STI units they replace. Additional, more precise engine balancing is also performed resulting in a smoother running engine, particularly at high RPMs. You may also upgrade to the professional series bearing packages, which is not an option with the Stage 1.
Please note when ordering we need to know specifically which cylinder head you will be using.
Our Stage 2 Tuner Series shortblock consist of a carefully chosen set of components engineered to be used together.
FEATURES:
- Brand-new EJ25 “STI” Semi-closed Block (2.5L Displacement)
- Billet Steel (4340) I-beam “Long” Connecting Rods
- Forged Aluminum “3D Chamber Matched” Pistons (8.5:1 CR, customizable)
- Heavy-Duty Chromoly Piston Pins
- Low Friction Piston Rings
- STI Forged Chromoly Crankshaft (79mm Stroke)
- Computerized Balance of rotating assembly
TUNER SERIES STAGE 3
Recommended up to 500-525HP.
Looking for the strongest short block possible without going to an expensive racing / professional series engine? Our Stage 3 Tuner Series block is the ultimate “street” block featuring high strength billet internals. Improving on the already formidable Stage 2 Tuner series engine, we replace the factory crankshaft with a higher strength billet steel unit. Our billet steel crankshaft retains the factory stroke, while significantly improving the oiling design necessary for high RPM use.
Please note when ordering we need to know specifically which cylinder head you will be using.
Our Stage 3 Tuner Series shortblock consist of a carefully chosen set of components engineered to be used together.
FEATURES:
- Brand-new EJ25 “STI” Semi-closed Block (2.5L Displacement)
- Billet Steel (4340) I-beam “Long” Connecting Rods
- Forged Aluminum “3D Chamber Matched” Pistons (8.5:1 CR, customizable)
- Heavy-Duty Chromoly Piston Pins
- Low Friction Piston Rings
- Billet Steel Crankshaft (79mm Stroke)
- Computerized Balance of rotating assembly