It only firms up the suspension on the non M X5/X6. Even then it is "barely" noticeable. No change in steering or throttle or shifts.
Other BMW models do various things , but not this one. (And I'm not sure about the X5M/X6M)
2014 650xi GC, Imola Red/Black. MsportEd, CWP, B&O, 20" wheels
2011 1M, Black loaded sans sat radio