JE Pistons Subaru EJ20 Ultra Series 92.5mm Bore -3.8 Dome (Set of 4 Pistons)

If you're building a high-performance Subaru EJ20 engine, especially one that's going to see serious boost, 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 power-adder builds. This set is specifically for the EJ20 engine and features a 92.5mm bore with a -3.8 dome, aiming for a 9.50:1 compression ratio.

What sets these apart is JE's proprietary Aligned Grain Flow forging technology. This process maximizes the tensile strength of the aluminum, making the pistons incredibly strong and able to withstand the rigors of high-horsepower racing engines. They also come loaded with custom-level features that are usually found on much more expensive, bespoke pistons. You get a thermal barrier crown coating to reflect heat, reducing crown temperatures and helping with exhaust scavenging. The skirts are coated to reduce friction and wear on both the piston and cylinder walls, which also helps quiet things down, especially on cold starts. Plus, they have lateral gas ports to help maintain a strong ring seal even at high RPMs and under heavy boost, and the included Trend Performance wrist pins are built tough for these demanding applications.

Every feature on these Ultra Series pistons is optimized for high-horsepower engines, and they're made 100% in the USA. Keep in mind that these are not CARB approved and cannot be shipped to California. For serious EJ20 builds, these pistons offer a well-built foundation for significant power gains.