JE Pistons SUB STI EJ257 Block w/ EJ20 Head 99.5mm Bore CR 8.5 KIT Set of 4 Pistons

If you're building a high-performance Subaru EJ257 engine and need pistons that can handle serious power, this JE Pistons kit is a solid choice. These pistons are specifically made for the EJ257 block when paired with an EJ20 head, featuring a 99.5mm bore and a compression ratio of 8.5:1, which is ideal for boosted applications where you need to control detonation. JE Pistons has been in the game for over 75 years, and they build these right here in the USA using 2618 aluminum, known for its strength under high stress.

What sets these apart is JE's proprietary Forged Side Relief (FSR) design. This means they've shaved weight by reducing the skirt width and using a shorter wrist pin, which also helps minimize friction and power loss. You'll also find an accumulator groove, which helps reduce combustion gas pressure for better ring seal and consistent power delivery. Plus, many applications get a skirt coating to further cut down on friction and noise, while also reducing wear on the cylinder walls. This kit comes complete with high-quality wrist pins, locks, and JE's Pro Seal premium piston rings, so you have everything you need to get them installed.

Keep in mind that these pistons are not CARB approved and cannot be shipped to California. They are designed for performance builds and are a significant upgrade over stock components, offering the durability and performance JE Pistons is known for.