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ok, just talked to my mechanic. both flutter and rattle are from cats. the explanation was a bit confusing(for a novice like me) but there's a crack on the cat where it connects to the manifold. because it passed emissions he says it's a tough sell to have porsche replace it, but a new one would get rid of the rattle. The other one he's taken off but couldn't reproduce the noise, so he's still checking it out. we talked about welding, which he says he's done in the past, but has found it to be relatively temporary as the high frequency vibration tends to crack them sooner than later. Bottom line - i know and trust these guys, so i'll probably go with their suggestions when they call me back with a quote. will keep you updated. dj
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