Any suggestions on how i would stop my bumper from rattaling? The whole this is rattiling. i own a 98 calaier. i am running 1 12" pheonix gold titanium elite sub and amp. both approx. 1500watts RMS i have tried dynamat but still nothing.

 

i just installed 2 oreion 1200d's running at 0.7ohms and 2 shocker 3 12's in a 99 calivier and there is hardly no rattling from the rear with mat at all

 

the problem is the bumper its self is rattaling from the vibration of the trunk and i have 1 layer of dynamat.i am running at approx. 147 db so there is alot of rattle.

 

It's not the bumper, it's what's behind the bumper.