[ckissick]

My Cayenne does very well on snow and ice with just M+S tires. I drove a pretty steep back-road with deep snow and pure ice on a steep hairpin, with no slipping. Going downhill, it stopped easily on the ice. I don't see a need for Mt/snowflake tires. But then, it's a Porsche. I have chains just in case, but I don't know if I'll ever need them.