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Yikes! It might be the heat shield, which is not hard to determine. I would check that before driving further and if you cannot be sure, pull the cam cover and check the variocam, cam chain and cam sprockets. You might check that stuff anyway even if you find a loose heat shield.
-Joel.
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1987 928S4
1992 968 cabrio
2009 957 Cayenne GTS
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