I think this thread contains multiple issues, for clarity, if you FEEL a vibration it may be but mostly likely WILL NOT BE the Cardan Shaft, which presents itself as a low frequency "sound" between 40mph and 60 mph from the first day you had your car due to a soft bearing. It impacts most 03's and a small number of early 04's both S and TT.

Dealers cannot rely on VIN to identify your vehicle, they have to look at the stamped part number in each case as remaining 03 parts were used to keep production running.

If the vibration is over 60mph then it is most likely a tire/suspension/tracking issue, remember that some peppers left the factory with tracking issues.

I think we need to make sure these do not get lumped together ( apart from those who only wish to vent about Porsche rather than be constructive about getting solutions to these problems).

I for one would like solutions not BS. Mine goes in Wednesday.