Quote:
Originally Posted by doccyber
"456 hp at 5,500 rpm and peak torque of 480 lb-ft from just 1,800 rpm, propelling the BMW M550i xDrive Sedan from 0 to 60 mph in 3.9 seconds"
Wow....
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Real HP is probably underestimated- much like the 340/440i
More likely around 480-500. Plus the X-drive adds about .2 sec so 4.1 for comparison to current M5 that does not get X-drive.