Have you ever been driving down the road and heard that buzzing noise right at the sweet spot rpm range if so this might just be your problem like it is mine. Reach up and touch your rear view mirror and see if the noise goes away. If so then this is your problem too. Now my question is. Is there any way to remove the mirror? Or am I stuck with some rigging to eliminate this problem. The mirror looks like it would just slide off but that is not the case and I dont want to bust my windshield trying anymore. So if anyone has any information as to how to remove the mirror and such please let me know. It is such a nussance

 

Check out the diy section. There is one on getting rid of that rattle.

 

This might help you!
Rear View Mirror DIY

 

Everyone has this problem. Here is the fix http://www.rdtiburon.com/index.php?showtopic=66