[racer]

Not sure how much snow you get.. but do consider ground clearance issues. The 911 isn't that high.. and with a set of dedicated snows it will be a monster with grip.. until it gets highsided on snow.

I've not heard too many issues with the 996 C4 system. Its much simpler and "less mechanical" system than the 964 debuted with.

Even IMS kits don't last forever (maybe 50K miles?) before their warranty runs out depending on brand.