I have the General Exclaim UHP on 18' RS4 wheel on my B7 and have a vibration at about 55-60 mph
Might it be the rims? Bent possibly?
I'd do a post in your appropriate regional forum to find a really good, reputable wheel shop that has the Hunter system in your area. Go there. See what they tell you. Bring the results to the other place to request a refund on services rendered. If a good place duplicates the Audi report, you should be able to get your money back from Firestone. If not, then Audi. With any luck this third place will actually be able to help diagnose the problem and FIX it.
Good luck.



