Part #: SC7423. CP forged pistons for WRX and STI models are a game - changer. They offer excellent ring seal, higher vacuum, less blow - by, greater durability, and more horsepower and torque across the power band. The peak horsepower stays consistent throughout the life of the piston rings, thanks to lightweight forgings and CP's unique machining methods. CP is all about top - notch 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 and is part of Pankl Racing Systems, a high - tech racing group supplying parts to big names 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 velocity and improving scavenging. The skirt coating provides extra lubrication in extreme heat or heavy - wear situations and reduces friction on the skirt. Coating options are applied to the whole set, adding 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 properly prepped and cleaned before installation. When putting the pistons in, follow the manufacturer's alignment marks carefully to ensure correct fit. During normal use, keep an eye on your engine's performance. If you notice any unusual noises or a drop in power, it might be a sign of an issue. For maintenance, change your engine oil regularly as dirty oil can cause premature wear on the pistons. If you've opted for the optional coatings, be aware that they add to the order time but also enhance the piston's performance. However, avoid using harsh chemicals when cleaning your engine as they can damage the coatings. In extreme heat or heavy - load situations, the skirt coating will provide extra lubrication, but still, don't push your engine beyond its limits for long periods. With proper use and maintenance, these pistons will serve you well for a long time.
