Does Dynamat really work? I want to get 2 JL 12w3 and a 500 watt amp for my 97 maxima. Will dynamat keep it from rattling outside of the car? I wan BASS and not rattles. And how much would it all cost to do the whole trunk?

 

Yes it works, Hit a shop and tell them you want a whole roll of cascade, dynamat, anything like that. 300 bucks.