8Pcs Pistons Rings Kit STD Φ89mm 11257598207 For M5 M6 X5 X6 M E70 F10 S63B44 4.4T Engines Pistons w/Rings Pins Accessories This 8 piece piston and ring kit is designed for use with 4.4L V8 twin turbo engines, specifically the S63B44 and S63B44TU variants found in select vehicle models.The kit includes 8 pistons, piston rings, wrist pins, and all necessary supporting components required for a full engine rebuild.Constructed to standard dimensions with a bore size of Φ89mm, the pistons maintain cylinder specifications, helping prevent issues related to cylinder expansion.The components are engineered to meet performance demands under stress and elevated operating conditions, suitable for both daily driving and performance applications.Designed for direct fitment, this kit supports compatibility with specific engine platforms without requiring modifications.It provides a complete solution for rebuilding the internal combustion assembly, and consistent power delivery.Intended for use by professional mechanics or experienced DIY individuals, the kit simplifies the rebuild process with clearly matched parts that follow OEM design parameters.Its comprehensive configuration allows for efficient assembly and dependable long-term function.