8pcs N63 Engine Pistons & Rings Set 11:1 for 550i 750i X5 F01 F02 F03 E70 E71 N63 4.4L V8 11257613626 11257576475 8907510000 Material: Aluminum Engine Model: Designed for N63B44 4.4L (4395cc) V8 Twin Turbo Engine Engine Compression Ratio: 11:1 Cylinder Bore Diameter: 89mm Piston & Ring Set: Includes 8 pieces for a complete engine overhaul Compression Height: 32.1mm Pin and Bolt Length: 60mm This piston and ring set is engineered to fit the N63B44 4.4L V8 Twin Turbo Engine, providing compatibility with models including 550i, 750i, X5 F01, F02, F03, E70, and E71.The 11:1 compression ratio supports performance-oriented driving with improved power delivery and throttle response. Disclaimer: This replacement is not affiliated with any manufacturer.Model references indicate fitment only.