Just a thought, for the amount you may spend on a second set of wheels and snow tires you might find a nice little beater car to drive in the winter leaving you new irreplaceable 1M in the Garage?
I don't ever plan on driving my car in the Snow and Salt.
2011 1M, Valencia Orange, All options.
August 8th ED (#293 of 739 or 740)
88 E30 M3 100% OEM 73K Miles
02 E39 M5 Le Mans Blue 50K Miles
06 E46 M3 ZCP 58K Miles