yeah, I heard some people talking about taht once...I think its that flat above the number plate that rattles. Try pumping some greatstuff expanding foam ($5 a can from Home Depot) into that area--I used that stuff in my friend's blazer and it sounds 100% clean, no rattles anymore...just make sure you're careful not to spill any on the paint of the car or anywhere where it'll be seen, doesnt come off too easily (at least not off plastic) <_<
http://www.dow.com/greatstuff/products/index.htm
I used "Gaps and Cracks" by the way. :thumbsup: