High-performance N63 crankshaft engineered for BMW 550i/650i/750i/X5/X6 with 4.4L TT V8 engines, ensuring optimal power transfer and durability. Precision-machined from forged steel for superior strength under high turbocharged loads, with micro-polished journals reducing friction by 15%. Direct OEM replacement featuring balanced counterweights and heat-treated surfaces to prevent warping at extreme temperatures. Includes factory-spec oil passages for seamless lubrication integration in stop-start driving conditions. Bulk pricing available for repair shops stocking BMW N63 rebuild kits. Ships in anti-corrosion packaging with laser-etched part numbers for instant verification.