CP Pistons & Rings 99.75mm Bore 8.2 Comp +.25mm Size WRX / STI Subaru EJ255 / 257 2.5L Turbo Models 2004-2019
CP WRX and 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.
- 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
Bought these last fall for my EJ255 engine build for my 2010 WRX. I got both top and side coated for maximum protection against wear and knock. I have about 4000 on my build so far and multiple pulls with no issues. I just received my oil analysis back and all readings were normal. Although these are forged and piston slap sound is common, they sound near identical to stock even when cold. Great product.