CP Forged 99.75mm Bore / 9.0:1 Comp Pistons & Rings WRX / STI Subaru Turbo Models EJ255 / EJ257 2004-2021

Part #: SC7426. CP's forged pistons for Subaru WRX and STI models are a game - changer. They offer excellent ring seal, higher vacuum, less blow - by, and greater durability. With lightweight forgings and exclusive machining, they boost horsepower and torque across the power band, and maintain peak horsepower throughout the piston rings' lifespan. CP is all about top - notch engineering. Using the latest forging and CNC machinery, along with strict quality control, they produce reliable and high - performance pistons. As a part of Pankl Racing Systems, CP supplies to big names in racing. You won't find better pistons for your EJ20 or EJ257. Optional coatings are available. The top coating reflects heat into the combustion chamber, increasing exhaust gas speed and scavenging. The skirt coating provides extra lubrication in tough conditions and reduces friction. Applying coatings to the whole set adds 4 - 6 weeks to the order time. Piston features include high - strength aluminum forgings, a super - lightweight design, full CNC machining and balancing within +/- 1 gram, an accumulator groove, double pin oilers, and included wrist pins.

Using these CP forged pistons in your Subaru WRX or STI is straightforward. Just install them according to your vehicle's manual. When ordering, keep in mind that if you choose the optional coatings, it'll take 4 - 6 weeks longer. For maintenance, regularly check the pistons for any signs of wear or damage. Make sure to use the right lubricants to keep them running smoothly. If you notice any unusual noises or performance issues, it's a good idea to have the pistons inspected by a professional. And always follow the general maintenance schedule for your car to ensure the pistons and the whole engine last a long time.