well.. for the rattling.. my whole rear end rattles like hell. i think one of the key places in our cars is around the tailights and licsense plate area (maybe just mine). just turn your shit up loud, go outside and listen for what rattles. besides.. the more dynamat, the more fun! haha. jk. and for the other question.. im sure that if you add another amp, it will increase in volume, but deepness, that would have to depend on the amp. dont know too much about running two subs of two different amps.. even though they both may say "300 watts", im sure that they are not the same.

^^what once was^^


^^what is now.. and permanently^^