2004 S4 conv vibration

[colinrob]

Hi when I it 100-ph there is a bad vibration, it is getting worse than when I first noticed it was quite scary today, thought it could be wheel balance but its perfect until 100 any ideas of anything else it could be? (car is still under warranty)

[Fort Jefferson]

Is it one of Blairs new speed limiters?

[colinrob]

Don't think so I previously went through it but today it felt like the wheel was loose (they are'nt because I checked them)