I just installed a set of Pirelli Winter Carving run flats as well. 315's and 275's. I paid the extra $15.00 per tire and had the good folks at TireRack install the carbide metal studs. Just had a week of the worst roads I've seen in Canada for a long time. (Freezing rain followed by 2 ft of snow, and a city with a crappy snow removal budget) The traction from the studded Pirelli's is almost too good. I could stop in about a 1/4 of the distance it would take anybody else. I almost got rear ended a dozen times.
The downside is now that the main roads are clear and dry, the studs make a hell of a lot of noise, but I'm happy to turn up the radio until April.
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