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Everyone's experience is different but this is I would do. Before swapping tires I would double check the tire pressure and set them to factory specs. If they are still too loud and harsh consider going down minus 1. Keep in mind the base 7 series wheel size is 18", not 19" or 20". I bought 7 series base wheels to but on my 640 GT and the ride is smooth and quiet. I went to this after cracking a 19" wheel and haven't had a problem since. These are wonderful cars and just may take a bit to dial into your needs.
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