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Sounds like the tranny to me. Mine makes the same sound you describe at low revs and high load. In fact, just about every manual tranny I've driven with sounds like that at low revs and high load. My 1998 F-150 pickup with a manual tranny sounded like that all the time.
If you're really concerned, have a local Porsche mechanic drive it and tell you what he thinks.
That's what I'd do.
-Scott
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