High-strength Wössner forged piston set for MINI Cooper S, JCW and GP models equipped with the N18 engine. Designed to handle increased boost and high-performance applications, these precision-engineered pistons offer superior durability, enhanced heat resistance and excellent ring sealing — making them an ideal choice for tuned, rebuilt or high-output N18 engines seeking improved performance and reliability.

Compression ratio is 10.2:1 ideally suited to R56 GP models. Can be run in N18 Cooper S and JCW models, if doing so we'd advise an ECU tune to correct. 

Available in standard 77mm