Rear Window Louvers
 

Do the rear window louvers for an 2000 mustang "rattle" or shake or anything when you are driving? I asked a friend of mine who had them on his old camaro and he said that they rattled the whole time he drove, do these have this problem or are they mounted tightly enough for that not to be a problem?
And if there are any other problems that occur with them please let me know.
-Thanks