I live in Chicago and "tried" to drive my 00 Boxster last winter and just gave up. I just have the stock 16' wheels/tires and found it was just to difficult to drive. The problems are the back window you can't see out of and the car is very low so after a snow plow comes by I got stock in the grooves of other peoples tires trying to make turns and cracked my spoilers
I also spun out alot on right turns...this winter im going to garage mine and get a front-wheel drive beater for the winter,,,unless Porsche comes out with their SUV
LOL
cheers
jk