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Open her up and have a look around. Maybe failing belt or pulley bearing. No way to tell for sure from your description. Any warning lights? Check engine lights?
For best response always include your year, model, mileage, and recent service or mods when troubleshooting.
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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