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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.

CP offers optional coatings to enhance the effectiveness of your pistons. The top coating is designed to reflect heat into the combustion chamber, thereby increasing exhaust gas velocity and greatly improving scavenging potential. The skirt coating offers additional lubricant in times of extreme heat or heavy wear situations. The coating is designed to reduce friction on the skirt by providing a buffer to the cylinder. Coating options are applied to the entire set and add 4-6 weeks to the order time.


  • Piston Features:
  • High-strength aluminium forgings
  • Super lightweight design
  • Fully CNC machined and balanced to +/- 1 gram
  • Accumulator groove included
  • Double pin oilers, force fed from oil ring
  • Includes Wrist Pins
  • FITMENT:
  • Subaru STI 2004-2007
  • Subaru WRX 2002-2005
Full Piston and Ring Sets


  • 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 $979.50 $653.00 3 available
EJ20 2.0L .5mm Oversize: 92.5mm Bore / 8.5 Compression. SC7400 $979.50 $653.00 2 available
EJ20 2.0L 1mm Oversize: 93mm Bore / 8.5 Compression SC7401 $979.50 $653.00 1 available
EJ255 & 257 2.5L Standard Size: 99.5mm Bore / 8.2 Compression. SC7420 $979.50 $653.00 5 available
EJ255 & 257 2.5L .25mm Oversize: 99.75mm Bore / 8.2 Compression. SC7422 $979.50 $653.00 3 available
EJ255 & 257 2.5L .5mm Oversize: 100mm Bore / 8.2 Compression. SC7421 $979.50 $653.00 5 available
EJ255 & 257 2.5L Standard Size: 99.5mm Bore / 9.0:1 Compression. SC7425 $979.50 $653.00 2 available
EJ255 & 257 2.5L .25mm Oversize: 99.75mm Bore / 9.0:1 Compression. SC7426 $979.50 $653.00 1 available
Piston Coating - Top (All 4) COAT-T $180.00 $120.00 Ships from factory in 2-3 days
Piston Coating - Skirt (All 4) COAT-S $195.00 $130.00 Ships from factory in 2-3 days
Replacement Piston Rings


  • Note:
  • CP Piston Rings are sold in sets of four (4) only.
Description Part # MSRP Price Inventory  
EJ20 92mm Piston Rings RS1317-3622-0 $210.00 $140.00 1 available
EJ20 92.5mm Piston Rings RS1317-3642-0 $270.00 $180.00 Ships from factory in 2-3 days
EJ20 93mm Piston Rings RS1317-3661-0 $210.00 $140.00 1 available
EJ257/EJ255 99.5mm Piston Rings RS1658-3917-0 $210.00 $140.00 1 available
EJ257/EJ255 99.75mm Piston Rings RS1658-3927-0 $210.00 $140.00 Ships from factory in 2-3 days
EJ257/EJ255 100mm Piston Rings RS1658-3937-0 $210.00 $140.00 Ships from factory in 2-3 days
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510 Hyde Park, Doylestown, PA 18902
Tel: 215.489.2820  Fax: 215.489.2826
Hours:
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©2014 JSC Speed Inc.
All Rights Reserved.

510 Hyde Park
Doylestown, PA
18902

Tel: 215.489.2820
Fax: 215.489.2826