It's not just the snow, it's the cold that affects the tires ability to grip. I would do the dedicated snow tire if you are going to change out your summer performance wheel/tire setup anyway.
+1 on the Blizzaks, I have these on my 3 series touring for the winter.
For this first winter (at least) my Z is going to stay cozied up in the garage.
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2011 E89 Z4 M Sport (Euro Delivery, Performance Center redelivery), Extended Nappa leather, Eisenmann Sport Exhaust
2003 E46 325i Touring
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