JE Pistons Subaru EJ20 Head/EJ25 Block Ultra Series Set of 4 Pistons

If you're building a high-horsepower Subaru EJ20 or EJ25 engine, JE Pistons' Ultra Series forged pistons are a solid choice. These aren't your average replacement pistons; they're designed from the ground up to handle the extreme cylinder pressures that come with serious boost. JE Pistons has packed these with features typically found only in custom racing applications, all made right here in the USA.

What sets these Ultra Series pistons apart is JE's proprietary Aligned Grain Flow forging technology. This process maximizes the material's tensile strength, giving these pistons the backbone needed for demanding power-adder builds. You'll also find a thermal barrier crown coating that reflects heat back into the combustion chamber, helping to keep piston crown temperatures down and improving exhaust scavenging. The included Trend Performance wrist pins are thick-walled and built for high-performance use. Plus, the skirt coating helps reduce friction and noise, especially during cold starts, while also minimizing wear on the piston skirts and cylinder walls. Lateral gas ports are included to help maintain a strong ring seal even at high RPMs and under significant boost, ensuring consistent power delivery.

This set includes four pistons, each with a 3.918-inch bore, an inverted dome/dish design, and a 0.905-inch pin diameter, with a compression ratio of 8.50:1. Keep in mind these pistons are not CARB approved and cannot be shipped to California. For the ultimate performance build, JE Pistons are a well-made option.