The difference between M-Sport suspension and xDrive is probably 20mm. xDrive sits 10mm higher than standard RWD suspension and M-Sport suspension sits 10mm lower than the standard RWD.
If you don't live at a place where it snow then stay away from xDrive, right now I'm about to spend about $2k to improve my xDrive suspension, not to mention the ridiculous wheel gap. xDrive also has more drivetrain power loss. Only makes sense if it's your daily driver at places where it snows.
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