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36-40psi hot. Start at 38 hot all around and chalk your tire shoulders to look for rollover. If you get no rollover at 38 you may get a little better grip at 36psi. Different drivers also have different preferences in terms of hot pressure and sidewall firmness.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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