You gotta grow with the market. There is a reason AMG is now using 4Matic. BMW already had a very very good performance oriented xDrive AWD system and the Performance Control system ( Torque Vectoring ) currently being used in X6M / X5M. We already know what the X6M is capable of in terms of handling...some people go as far as calling it a GTR with a suspension lift. Now Imagine the M5, which is lighter, has a more powerful engine, much lower center of gravity, can do with the same.
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