JE Pistons 389616 Ultra Series Piston Kit for 2019-2025 BMW Z4 M40i

The JE Pistons BMW Ultra Series +9.10cc Dish 82mm Bore Piston Kit is a set of high-performance forged pistons designed for BMW engines. Built with JE’s proprietary Aligned Grain Flow forging technology, these pistons offer exceptional tensile strength, making them suitable for extreme cylinder pressures encountered in high-boost or power adder engine builds. Equipped with features such as thermal barrier crown coating, skirt coating, and gas ports, the Ultra Series pistons deliver durability, thermal stability, and enhanced performance for demanding applications. Made 100% in the USA, these pistons are engineered to withstand the rigors of high-performance tuning and racing environments.

Designed for BMW engines with an 82mm bore, these pistons are compatible with various models requiring +9.10cc dish configurations. They are ideal for engine builds that demand increased compression and strength, suitable for both street and track use. The kit includes six pistons, making it suitable for a complete engine rebuild or upgrade. Installation involves direct replacement of stock pistons, providing a reliable upgrade for high-performance BMW applications. These pistons are perfect for enthusiasts seeking maximum strength and durability in their high-boost or modified engines.