if i put 2 punch hx2 12's with the punch 800.2 amp, would i need to add ALOT of sound dampening to my drunk to get rid of the rattles? if so, how much would i need and how much would it cost?

 

I would use roughly 40 to 100 sq feet of either peel and seal or ramm mat. Or any number of other materials readily available. And one to four cans of expanding polyurethane foam, and some myraflex or a foam mattress pad from wal*mart. How much you use depends on your budget, the weight you will add, and how much reduction in trunk isolated vibration.