I've been driving the past 7 winters with OEM sized winter tires on an 911C4 cab and 335XI w/sport package. I went -2 on an FX45 because that was the largest winter tire I could get in '04. I have never had any problems driving through the snow. IMO ground clearance is going to be more of a limiting factor than the width of the tires. I think you'll do fine with OEM sizes.
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Rich
'96 911 C4 Cab (276,000 1 owner smiles)
'11 X3 35i Black Sapphire/Beige,SAP, CP, CWP, DHP, PREM, TECH, Sat radio, Hi Fi, BMW apps, smartphone, 19" w/mixed performance tires.
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