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Probably heat shielding and may indicate a motor mount getting sloppy.
Porsche used cheap-*ss sheet metal screws to hold the alloy heat shielding together. After time, especially if they've ever been loosened and re-tightened, the holes in the alloy shields expand and the sheet metal screws can no longer hold it tight.
The fix is to get small gauge SS machine screws with a nut and lock washer. You could try larger sheet metal screws, but you'd be right back in the same boat in 6 mos. to a year.
Cheers!
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