JE Pistons Ultra Series Honda K20A 86mm Bore 10.0:1 CR Set of 4 PistonsUltra Series forged pistons from JE are the industry? s strongest, most fully featured pistons available off the shelf. Offered for a wide range of import and sport compact applications from 2JZ to 4G63 and Audi to BMW, Ultra Series pistons feature JE? s proprietary Aligned Grain Flow forging technology providing next level tensile strength ideal for the extreme cylinder pressures of power adder engine builds. Equipped with custom level features