This may not be applicable to all of you, but those who've dropped their ride and/or have larger rims, the car rides a little tighter and that rear mirror tends to vibrate quite a bit. I finally got fed up and found an easy fix. Get one of those squeeze grip balls and shove it up behind the mirror so it's between the mirror and the front window. Voila, problem solved. Plus you can grab it and exercise with it anytime.

At first I was looking for something to shove between the mirror and the roof, but the ez grip ball works pretty good and isnt really visible (black one)

No more vibrations and everything is clear in the rear mirror now

 

Pretty cool tip leedogg, just gotta buy a "cool" looking one, i guess!

 

i got 145db slammin behind me in the trunk.....i dont know if it would help. =)

 

I've been looking around for something cool looking I can shove between the mirror and the roof for the longest time, if anybody finds something, let me know. But barring that, shoving the black ezgrip ball behind the mirror, it sits way up back there and isnt really noticeable.