CP Pistons & Rings 99.75mm Bore 8.2 Comp +.25mm Size WRX / STI Subaru EJ255 / 257 2.5L Turbo Models 2004-2021

Part #: SC7422. CP forged pistons for WRX and STI are a game - changer. They offer excellent ring seal, higher vacuum, less blow - by, amazing durability, and a significant boost in horsepower and torque across the power band. What's even better is that peak horsepower stays consistent throughout the lifespan 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 back it up with strict quality control. This results in a high - performance and reliable product every time. CP has some of the highest quality control standards in the industry. As a part of Pankl Racing Systems, which supplies engine and suspension parts to top - level racing teams and elite brands like Ferrari and Porsche, CP pistons are unbeatable 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, reducing friction on the skirt. These coating options are applied to the whole set, but they 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 these CP pistons is straightforward. First, make sure your engine is properly prepped and cleaned before installation. When putting in the pistons, follow the standard engine assembly procedures. Be careful to align the pistons correctly in the cylinders to avoid any issues. As for maintenance, it's a good idea to regularly check the engine oil level and quality. Clean oil is crucial for the smooth operation of the pistons. Also, keep an eye on the engine's temperature. If it runs too hot, it can cause extra wear on the pistons. If you've opted for the optional coatings, note that they are designed to enhance performance, but they do add some time to the order. There's no special maintenance for the coatings, but just be aware that they're there to help in extreme conditions. If you notice any strange noises or a drop in engine performance, it might be time to have the pistons inspected by a professional.