Part #: SC7423. CP forged pistons for WRX and STI are a game - changer. They offer excellent ring seal, higher vacuum, less blow - by, great durability, and more horsepower and torque across the power band. The peak horsepower stays strong throughout the life of the piston rings. Thanks to lightweight forgings and CP's unique machining methods, these pistons are top - notch. CP is all about superior engineering. They use the latest forging techniques and CNC machinery, and strict quality control ensures a high - performance and reliable product every time. CP has some of the highest quality standards in the industry. It's a part of Pankl Racing Systems, a high - tech racing group that supplies parts to big - name teams and companies like Ferrari and Porsche. You won't find better pistons for your EJ20 or EJ257. CP also offers optional coatings. The top coating reflects heat into the combustion chamber, increasing exhaust gas speed and improving scavenging. The skirt coating provides extra lubrication in extreme heat or heavy - wear situations, reducing friction on the skirt. These coatings are applied to the whole set, but add 4 - 6 weeks to the order time. Piston features include high - strength aluminum forgings, a super - lightweight design, full CNC machining and balancing to +/- 1 gram, an accumulator groove, double pin oilers fed from the oil ring, and wrist pins.
Using these CP pistons and rings is straightforward. First, make sure your engine is clean and free of debris before installation. When you get the set, check all the components carefully to ensure nothing is damaged during shipping. If you've opted for the optional coatings, keep in mind that they add extra protection but also extra time to your order. During installation, follow the standard procedures for piston and ring installation. Use the right tools and be gentle to avoid damaging the pistons or rings. As for maintenance, keep an eye on your engine oil. The double pin oilers and the ring system are designed to work well with proper lubrication. Change the oil regularly according to your vehicle's manual. If you notice any unusual noises or performance issues, check the pistons and rings for signs of wear. Also, avoid over - revving the engine, as this can put unnecessary stress on the pistons. Overall, with proper use and maintenance, these CP pistons and rings will serve you well for a long time.
