for the license plate thing, you can use a wad of paper towels but it gets pretty nasty after a few car washes. Dynomatt makes license plate foams which are pretty nice and work great. costs around 19 bux well worth it not sounding ghetto when blasting your music down the street. especially when ur in an audi.

 

another thing you can do to stop your license plate from rattling is use the soft piece that comes from velcro. I got it at a craft store for cheap and it made a big difference.

 

if i removed my 2 subs and packed my box with some polyfill stuffing..would that help me acheive a cleaner thump, thus reducing a little of the loud buzz, which would also help with the rattling?

anyone use poly fill (i was thinking of picking up some batting in the material section of walmart) because i read its the same thing....does anyone have any experience with the sound changes it can produce?