8pcs STD Φ89mm Engine Pistons Rings Wrist Pin Kit for M5 M6 X5 X6 M E70 F10 S63B44 4.4T 11257556955 11257598207 Φ22mm This 8-piece kit includes STD Φ89mm engine pistons, piston rings, and wrist pins designed for engine rebuilds and performance.Constructed from forged aluminum, the pistons offer under -stress conditions and are sized to fit specific engine configurations.The included rings help maintain proper compression and reduce oil consumption, supporting consistent engine.The wrist pins measure Φ22mm and are built to handle performance applications. The kit is engineered for compatibility with S63B44 4.4T engines used in select vehicle models.Its design supports both daily driving and performance use, providing internal components that contribute to overall engine efficiency and power output.Installation is intended to be straightforward for those performing engine overhauls or enhancements, making it suitable for experienced mechanics and enthusiasts alike. This product is a third-party alternative.Brand/model references are included only to assist with compatibility identification.