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The real question is how competitive are your regional events and how competitive are you.
The A6 will likely be among the fastest tires for Autocross, but they are expensive and don't last long. I noticed they now make a 225/40-17 which paired with a 245/40-17 would work on stock rims. The smaller diameter 245 would also give you a bit of a gearing advantage.
Now if you are really competitive you should get wider rims in a 17 or 18 and run at least least 245F and 275R.
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