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Re: Snow tires, you can run 19's or 20's with no problems generally. I've not switched from 21's to 20's when the seasons changed, so I am not sure if the car needs to be reset to account for the different wheel/tire sizes. I found that the car is very sensitive to it as I was running a non-stock aspect ratio in the rear with a set of snow tires and it caused the traction control to go off at 75%+ throttle, regardless of condition. Switched back to stock sidewall height and problem solved. I run 21's in summer (PS4S) and 21's in winter (Winter Scorpion). We had our last snow here hopefully (it snowed last week but is 80 today) so the summer wheels/tires go on here in the next few days.
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It doesn't cost much for a new set of wheels for the winter ($1,000). If you plan to drive in a safe but sometimes aggressive way in the summer, get a second set of wheels and snow tires for the winter. You will be much safer in both seasons. There is also no comparison between AS and snow tires.
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It was very sensitive and I switched it on accidentally.
Not cool.






