Hi guys,
I am having this problem with my newly purchased '08 S5 as well, coming from the drivers side. At speeds above 50mph, the wind starts to howl and it becomes very pronounced on the highway around 70+mph.
I bought it from carmax. They replaced the entire weather stripping for the door, which took the noise from a whistle down to a pronounced announcing whooshing sound.
I took my car to Audi and the service manager said it's just normal (think he was clueless).
Would Audi still honor the follow TSB today if I took it in, or would they try to charge me? The car still has a couple weeks left on its warranty at carmax, but they and the local Audi dealer seem clueless, either telling me they can't hear it or that it's "normal". :no:
I just took mine back to the dealer and asked them to readjust the front driver's window. They told me that there's a TSB (technical service bulletin) for the issue. If you tell them about TSB# 2017462/1 they'll adjust the door seals and repair the roof trim mouldings as well.