Chris,
Check with Tirerack to be sure but it sounds like too much tire for the stock rim width. If I recall correctly 225 is the widest recommended size for a stock front rim. When you go larger the sidewall just starts to roll over and you don't get any benefit.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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