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Last year I ran 255/40/17 all around with no rubbing issues, same OD at 25" to your stock 18 tire. I have stock shocks and GT3 front sway. I suspect the 18x10 wheels are a bit on the heavy side for the track.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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