I think that I have an understanding about AWD with Traction Control but am not sure how BMW's Dynamic Stability Control works. For example Audi has a permanent 50/50 split with a center diff that transfers torque to the non slipping axle when slip is detected. Their Traction Control system then uses ABS to transfer power to the non-slipping wheel on a given axle. From what I read, BMW uses ABS with some other "things" that I am not sure of to prevent slipping. Can someone explain this system and its advantages? What happens if both rear wheels begin to spin on the BMW? I assume that you then have no traction. Are there any advantages to this system over AWD? Does this system help you "go" in slippery conditions or does it just keep you going where you want to go? I read the AWD vs RWD thread and am not sure of the above.