JE Pistons Ultra Series Mitsubishi EVO 7-9 4G63 86mm Bore 10.0:1 CR Set of 4 Pistons

If you're building a high-horsepower Mitsubishi EVO 7-9 with the 4G63 engine and planning on serious boost, you need pistons that can handle the extreme cylinder pressures. JE Pistons' Ultra Series are designed specifically for these demanding applications, offering a robust package that's ready for a wide range of import and sport compact performance builds. These aren't just standard replacement pistons; they're built from the ground up to withstand the rigors of boosted engines.

What sets the Ultra Series apart is JE's proprietary Aligned Grain Flow forging technology. This in-house process maximizes the tensile strength of the aluminum, giving these pistons the backbone needed for high-boost situations. You also get custom-level features right out of the box. The thermal barrier crown coating reflects heat back into the combustion chamber, helping to keep piston crown temperatures down and improving exhaust gas scavenging. For reduced friction and wear on both the piston skirts and cylinder walls, a skirt coating is applied, which also helps quiet down operation, especially during cold starts. Lateral gas ports are included to help maintain a solid ring seal, even at high RPMs and under significant boost, ensuring consistent power delivery. The kit also includes strong, thick-wall wrist pins from Trend Performance, built to handle the demands of power-adder engines.

This set is for a 4-cylinder 4G63 engine, with an 86mm bore and a 10.0:1 compression ratio, featuring an inverted dome/dish design. Every component in this kit is made 100% in the USA, ensuring a well-built product ready for your performance build. Please note that these pistons are not CARB approved and cannot be shipped to California.