JE Pistons Ultra Series Mitsubishi EVO 7-9 4G63 85mm Bore 10.0:1 CR Set of 4 Pistons

When you're rebuilding the engine for your Mitsubishi EVO 7-9 and aiming for serious power, the JE Pistons Ultra Series set is what you'll want. This kit includes four forged pistons, each measuring 85mm with a 10.0:1 compression ratio, designed specifically for the 4G63 engine. These aren't just standard replacement pistons; they're built from the ground up to handle the extreme cylinder pressures that come with high-boost applications.

What sets these pistons apart is JE's proprietary Aligned Grain Flow forging technology, which maximizes tensile strength for unmatched durability under stress. You also get 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 high-strength Trend Performance wrist pins are built tough for demanding builds. Plus, the skirt coating helps reduce friction and wear on both the piston and cylinder walls, leading to quieter operation, especially when the engine is cold.

To ensure a solid ring seal even at high RPMs and under significant boost, these pistons feature lateral gas ports. Every aspect of the Ultra Series design is optimized for high-horsepower racing engines, and they are proudly made 100% in the USA. Keep in mind these pistons are not CARB approved and cannot be shipped to California. You'll also need to refer to JE Pistons' installation instructions for proper fitment and assembly details, as specific hardware like rings and locks may be sold separately.