Hi there
To help us help you, a few questions -
1. What engine do you have?
2. Does it happen at a particular point in the rev range, or at all times?
3. Does it happen only on full throttle, or at part throttle ?
4. Is it worse in a particular gear?
5. Any new noises?
6. Do you have access to VAGCOM - will be worth seeing if there are any error codes logged