Product Information
Part #: SC7425. CP's forged pistons for WRX and STI models are a game - changer. They offer excellent ring seal, higher vacuum, less blow - by, and greater durability. You'll experience a significant boost in horsepower and torque across the power band, and the peak horsepower stays consistent throughout the piston rings' lifespan. Thanks to lightweight forgings and CP's unique machining methods, these pistons are top - notch. CP is all about high - end engineering. They use the latest forging techniques and CNC machinery, backed by strict quality control. This ensures a product that focuses on both performance and reliability. In fact, CP has some of the highest quality control standards in the industry. As a part of Pankl Racing Systems, a high - tech racing group that supplies to Formula One, F3000, IRL, CART, World Rally Racing teams, and elite brands like Ferrari and Porsche, you won't find a better piston 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. It reduces friction on the skirt by acting as a buffer to the cylinder. Coating options are applied to the whole set and add 4 - 6 weeks to the order time. Piston features include high - strength aluminium forgings, a super lightweight design, full CNC machining and balancing to +/- 1 gram, an accumulator groove, double pin oilers force - fed from the oil ring, and wrist pins.
Using this CP piston and ring set is straightforward. First, make sure your engine is clean and free of any debris before installation. During installation, handle the pistons carefully as they are precision - made. Follow the standard engine assembly procedures and torque specifications provided by Subaru for your EJ257 or EJ20 engine. When it comes to using the vehicle, let the engine warm up properly before pushing it hard. This helps the pistons and rings seat well. As for maintenance, keep an eye on your engine oil level and quality. Change the oil regularly according to the manufacturer's recommendations. If you've opted for the coated pistons, note that the coating enhances performance but the order takes 4 - 6 weeks longer. Also, in case of any abnormal engine noises or performance issues, have your engine checked by a professional right away.
