JE Pistons FA20 - 4UGSE 13.5:1 KIT Set of 4 Pistons

If you're rebuilding the engine in your FA20 Subaru and looking for a significant bump in compression for improved power, this JE Pistons kit is a solid choice. These pistons are designed to raise the compression ratio to 13.5:1, which means more power and better throttle response when paired with appropriate tuning. JE Pistons has been making forged performance parts for decades, and this kit is built with that experience in mind.

Crafted from 2618 aluminum right here in the USA, these pistons offer the high tensile strength needed for demanding performance applications. They feature JE's proprietary Forged Side Relief (FSR) design, which helps minimize friction and reduce weight by using a narrower skirt and a shorter wrist pin. Depending on the specific application, you might also find an accumulator groove to help manage combustion gas pressure, leading to better ring seal and consistent power delivery. Some applications also include a skirt coating to further reduce friction, wear, and even operating noise.

This kit comes complete with everything you need to get your engine rebuilt: four forged pistons, high-quality wrist pins, locks, and JE's Pro Seal premium piston rings. Just remember, these are not CARB approved and cannot be shipped to California. Make sure you have a plan for tuning to take full advantage of the increased compression.