Your M550i xDrive was missing some ponies. We helped find them, and the 523-hp sedan is now 0.6 second quicker to 60 mph.
Our test of the 2021 BMW M550i xDrive earlier this year revealed a slower-than-expected 4.1-second time to 60 mph. While that beats the time a Ferrari F40 set 30 years ago, these days that’s slower than the 3.9 seconds it took us to get to 60 in an X5 M50i that weighs 856 pounds more than the M550i.
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