02-07 WRX & STI CP Forged Pistons & Rings
CP WRX & STI forged pistons feature superb ring seal, higher vacuum, lower blow-by, greater durability and increased horsepower and torque through the power band. Better yet, peak horsepower is retained through the life of the piston rings. This is achieved by lightweight forgings and CP's exclusive machining techniques and processes. CP's commitment to racing is reflected in every piston they produce.
CP is dedicated to superior engineering, utilizing the latest forging techniques and CNC machinery and backing it up with rigorous quality control makes for a top-notch product every time that emphasizes performance and reliability. CP has some of the highest quality control standards in the industry. CP is a division of Pankl Racing Systems, a high-technology racing group supplying engine and suspension components to numerous Formula One, F3000, IRL, CART, World Rally Racing teams and to such elite companies as Ferrari and Porsche. You will not find a finer piston for your EJ20 or EJ257.
- Piston Features:
- High-strength aluminium forgings
- Super lightweight design
- Fully CNC machined and balanced to +/- 1 gram
- Include wrist pins
- Accumulator groove included
- Double pin oilers, force fed from oil ring
- FITMENT:
- Subaru STI 2004-2007
- Subaru WRX 2002-2005
- Notes:
- CP Pistons do not include pin retaining locks; they require OEM pin locks.
- CP Pistons are sold in sets of four (4) and include piston rings
- CP Pistons are different between the EJ20 2.0L & EJ255 & EJ257 2.5L engines; choose accordingly below.
| Description | Part # | MSRP | Price | Inventory | |
|---|---|---|---|---|---|
| EJ20 2.0L Standard Size: 92.0mm Bore / 8.5 Compression. | SC7399 | $1,128.00 | $592.00 | 1 available | |
| EJ20 2.0L .5mm Oversize: 92.5mm Bore / 8.5 Compression. | SC7400 | $1,128.00 | $592.00 | Usually ships next day | |
| EJ20 2.0L 1mm Oversize: 93mm Bore / 8.5 Compression | SC7401 | $1,128.00 | $592.00 | 1 available | |
| EJ255 & 257 2.5L Standard Size: 99.5mm Bore / 8.2 Compression. | SC7420 | $1,128.00 | $592.00 | 1 available | |
| EJ255 & 257 2.5L .25mm Oversize: 99.75mm Bore / 8.2 Compression. | SC7422 | $1,128.00 | $592.00 | Usually ships next day | |
| EJ255 & 257 2.5L .5mm Oversize: 100mm Bore / 8.2 Compression. | SC7421 | $1,128.00 | $592.00 | Usually ships next day |
- Note:
- CP Piston Rings are sold in sets of four (4) only.
| Description | Part # | MSRP | Price | Inventory | |
|---|---|---|---|---|---|
| EJ20 92mm Piston Rings | RS1317-3622-0 | $184.00 | $96.00 | 2 available | |
| EJ20 92.5mm Piston Rings | RS1317-3642-0 | $184.00 | $96.00 | 1 available | |
| EJ20 93mm Piston Rings | RS1317-3661-0 | $184.00 | $96.00 | 1 available | |
| EJ257/EJ255 99.5mm Piston Rings | RS1658-3917-0 | $184.00 | $96.00 | Usually ships next day | |
| EJ257/EJ255 99.75mm Piston Rings | RS1658-3927-0 | $184.00 | $96.00 | 3 available | |
| EJ257/EJ255 100mm Piston Rings | RS1658-3937-0 | $184.00 | $96.00 | 3 available |
