Quote Originally Posted by Navigator
Get the license plate kit...
DOH! I forgot about that. Yeah, ditto what he said. If you have subs pushing any power at all it'll vibrate the heck out of your rear plate. You won't hear it inside, but you'll sound like a 17 year old ricer from 1/2 a block away (THUD-THUD-BUZZZZZT, THUD-THUD-BUZZZZZT...).

I personally didn't use any type of kit - I just took some extra foam and rubber sound damping material, cut it slightly smaller than the plate, stuck 4 holes through it, and attached it behind my plate. No more clanging plate. Any foam or rubber should work. Heck, a piece of cardboard would work. But whatever you do, don't forget the plate!