8Pcs Pistons Rings Kit STD Φ89mm 11257598207 For M5 M6 X5 X6 M E70 F10 S63B44 4.4T Engines Pistons w/Rings Pins Accessories The 8Pcs Pistons Rings Kit STD is designed for use with S63B44 and S63B44TU 4.4L V8 Twin Turbo engines.It fits models including M5, M6, X5M, X6M, F10, F06, F12, F13, E70, and E71.The kit features a standard 0.00 specification with a bore size of Φ89mm, maintaining cylinder dimensions to support proper engine function.Constructed for and performance, the set includes 8 pistons, piston rings, wrist pins, and all necessary accessories for a complete rebuild.Components are engineered to meet OEM specifications, compatibility and under performance conditions.This comprehensive kit supports efficient installation and is suitable for both professional mechanics and DIY enthusiasts working on engine overhauls.Designed to restore engine integrity, it contributes to consistent power output and long-term engine performance.