JE Pistons 07+ Mitsubishi EVO X 4B11 86.25 Bore 9.0:1 CR 0.25 Oversize (Set of 4)

JE Pistons is known for making well-built forged pistons that stand up to serious use, drawing on over 75 years of experience. This set is specifically made for the 2007 and later Mitsubishi EVO X with the 4B11 engine. It's a 0.25 oversize set, meaning the bore size is 86.25mm, and it's designed for a 9.0:1 compression ratio. These pistons are built for high-demand performance applications, offering a solid combination of durability and performance.

These pistons are forged in the USA using 2618 aluminum, which gives them the high tensile strength needed for demanding engine builds. They feature JE's proprietary Forged Side Relief (FSR) design, which helps minimize friction and power loss by using a reduced skirt width and a shorter wrist pin, saving weight. Depending on the specific application, they may also include an accumulator groove to reduce pressure from combustion gases, helping with ring seal and preventing flutter. A skirt coating, also application-dependent, further reduces friction and wear on the piston skirts and cylinder walls, while also helping to quiet down operation.

This kit comes complete with high-quality wrist pins, locks, and JE Pro Seal premium piston rings, making it a comprehensive package for rebuilding or upgrading your EVO X's engine. They are engineered specifically for this engine and its intended use, aiming for optimized performance and durability. Please note that this part is not CARB approved and cannot be shipped to California.