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Stem Crankshaft N57D30 for BMW OEM 11217799970. 24-Month Warranty: Comprehensive 24-month warranty coverage for peace of mind. ISO 9001 & CE Certified: Meets international quality and safety standards. Full Customization: Offers full customization, minor customization, and flexible options. In-House Manufacturing: Complete production line from melting to inspection in our factory. 100% Quality Inspection: Rigorous visual and functional inspection for all finished products. 25 Years Export Experience: Over two decades of reliable export service and expertise. OEM & ODM Services: Professional OEM and ODM services available for custom needs. Fast Lead Time: Consistent 15 workdays lead time regardless of peak or off-season.