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You have one of these composite driveshafts for the A4 yet?
I have vibrations at ~3500 to 4500 rpm in N or D... dealer scares me with "it must be in the engine" which runs strong and very smooth at any other speed. I have felt that it is in the driveline somewhere.
read my posting about engine and driveline vibration experience. It may shed some light on your vibration problem.
We run one in Tommy's car. The weight reduction is there, but the stock Al shaft isn't really all that heavy to begin with. We haven't seen any vibration issues.
So far its handled everything we could throw at it...
I would have purchased that CF driveshaft it I would have thought it necessary for my car. I have seen others beat the hell out of the OE shaft and not have any problems. When I owned several F-body's the best upgrade available was the 3" LPE aluminum driveshaft. I used one of those for years and I wasnt able to destroy it.