High speed vibration - need help tracking down

[G2]

Here was my vibration problem
Thank God I made it home in one piece

Sorta scary there.

Check wheel bearings in addition to control arms. This is very hard to do and takes a deft touch for the bearings. Best way is to remove the wheels, brakes and axles. PITA but I know it works.

Another way of looking at it: if you're past 100K miles, then the bearings are due. They can become both tight and/or loose. In my case one of each. Have replaced bearings on 3 or 4 RS6's so far.

It will steer and handle so much better also.