Hand-built 4.4-liter twin-turbocharged V8, rated at 540 horsepower, with Alpina-specific engine programming, reinforced cylinder heads, MAHLE pistons, additional cooling hardware, and an Alpina-tuned eight-speed automatic. The front brake rotors and pads were replaced before the sale, while the CARFAX records a cooling-system check and coolant flush in July 2024, plus an air-conditioning condenser, oil-pan gasket, and spark-plug replacement in June 2024.