If it is really stuck, soak it in penetrating oil and let stand overnight. I have had luck by starting the process by turning clockwise just enough to break it loose and then backing it out. Sometimes the bolt is just corrosion-welded to the wheel carrier and nothing will prevent it from stripping out. Then you will need a timesert or fresh wheel carrier.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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