Those tire and wheel sizes are a mismatch and no way you are stuffing 305s under the wheel well without adding widebody flares. 225/265 are standard sizes while 245/275 will fit if you choose offsets carefully.
Shop tirerack.com for a better approach to fitment.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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