Crafted in the USA by JE Pistons using robust 2618 aluminum alloy, this kit includes four forged pistons specially designed for the 1.8T 20V engines of the Audi S3 8L, TT 8N, Leon 1M, among others. Available in three bore sizes: the standard 81.0mm, and oversized options of 81.5mm and 82.0mm for mac..