FWIW - the default CarSim D-Class sedan has the sprung center of mass .54 m above the ground. The wheel center is .335 m above ground, which should be *at least* lower than the driveshaft + xdrive hardware. Thus the difference is .205 m which is not enough to lower the CM of a 328ix as compared to sport suspension 328i using my calculation above.
The GT model in carsim (supposed to be a Porsche) has the CM .39m above ground and wheel center .325m above ground. So for a sports car with low CM the xdrive would do nothing to the CM.
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