Audi S3 Rear End Whine

Grant-s3

Nogaro Blue
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Hi guys. I have a 2008 Audi S3. At around 75-85mph there is a whine from the back end. It only happens when I touch the throttle on the run down it won't do it. After 85 it goes away.

The car had a new diff under warranty by audi about 1000 miles ago. Genuine oil and never made this noise until last week. I thought wheel bearing but why would it do it only when I touch the throttle ?? Any thoughts.
 
I have noticed this too. Seems to happen accelerating as the weight is transferred to the rear. I'm putting it down to either a wheel bearing or tyre noise rather than rear diff. Hope I'm not wrong...
 

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