2021 BMW M550i, 540i Getting Software Update To Fix Slow 0-60 Times

Motor1.com generally doesn’t do instrumented performance testing on new vehicles, but Car and Driver has done just that for decades. Last year BMW pulled the covers from its mildly updated 5 Series, including the snazzy M550i xDrive packing a 523-horsepower (390-kilowatt) twin-turbocharged V8 under the hood. BMW says it reaches 60 mph in a scant 3.6 seconds, but the C&D team found otherwise. Eventually, so did BMW. More on that in a bit.

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