that vent rattles on my car too cuz its like a flap... i was thinkin about maybe gluing it shut and just putting holes in it instead... i gotta try somethin cuz its annoying!!!

 

AND!! my D.I.C rattles too haha im sure im not the only one with that problem.. a buddy of mine has that issue too and i was in his car and heard it and was like "wow thats really annoying" sure enough lol now mine does too... karma sucks.