A bit of snow here today as well, third snow dump of the season.
Wasn't really racing anyone myself, but RWD and great brand new set of winters did great today.
At the risk of sounding very boring, I agree with others though, assuming xDrive is bulletproof (and racing) is dangerous. I generally pay a bit more attention behind the wheel of my car, comparing to my wife's (RWD Vs. AWD, both with great winter tires).