JE Pistons SUB STI EJ257 99.5mm Bore CR 8.5 KIT Set of 4 Pistons

When you're rebuilding the heart of your Subaru Impreza, especially for performance applications, you want pistons that can handle the stress. This kit from JE Pistons gives you a complete set of four forged pistons specifically made for the EJ257 engine, with a 99.5mm bore and a compression ratio of 8.5:1. These aren't just standard replacement parts; they're built for demanding use, whether you're pushing your car on the track or just want a more robust engine for the street.

JE Pistons has been making high-performance pistons for a long time, and they forge these right here in the USA from 2618 aluminum. This material is known for its strength, which is crucial when you're dealing with increased cylinder pressures. The design includes their proprietary Forged Side Relief (FSR) forging, which helps reduce friction and skirt wear, saving a bit of weight too. Depending on the specific application, you might also find an accumulator groove to help maintain a good ring seal and a skirt coating to further cut down on friction and noise. This kit comes with everything you need to get them installed: high-quality wrist pins, locks, and JE's Pro Seal premium piston rings.

This set is designed as a direct fit for your 2002-2012 Subaru Impreza, and also fits certain Forester and Legacy models. Keep in mind that these pistons are not CARB approved, so they cannot be shipped to California. If you're looking to build a stronger, more reliable engine, this JE Pistons kit is a solid option.