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Hey, i already have 2 punch z 12", with a fosgate 401S amp, but i want to add two punch he2 12s and i want to run about 400 watts to each he2, but i was wondering where can i find a box to hold 4 12's in an 87 chevy regular cab, or would i have to build one, and what amp should i use?? id like to keep it all fosgate, but should each one have its own amp or just one bigger amp for the two he2's?any help would be appreciated...thanks.