BMW M550i xDrive Acceleration Issue Has Been Solved

The BMW M550i xDrive, which received a refresh last year, is more than good enough for a majority of performance sedan customers. If not, there’s the M5. The former comes powered by a 4.4-liter twin-turbo V8 packing 523 horsepower and 553 lb-ft of torque. Like we said, more than good enough.