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Just to follow up on this thread - I ended up going with 18" EC7s for several reasons: 235 tire selection and prices were better for 18" wheels, and also, I like the look of the EC7s better.
I'm very satisfied with the decision. With both lighter tire and wheel, I'm down ~4lb per corner. I just got back from a track weekend at Watkins Glen and was in the ballpark of 7s/lap faster!! Had no idea 10mm of tire would make that much difference, but wow. Rarely had open track over the weekend since it was a busy event, but the overall times were that much lower.
Not sure how much of that is the 18" vs 17" wheels, but in any case, it made a huge difference from the stock 17's, and the car feels almost perfect now. As I said, very satisfied with the upgrade!
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