if you are committed to taking your M3 to the slopes, you really don't have a choice but to get a winter set. it sucks justifying the cost of the setup for just a few miles or just a few days a year, but chains aren't really feasible, and the summers could be deadly. its not worth the risk, IMO. just get something cheap through tire rack that will get the job done. or buy something used from somebody on here.
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