Hey guys, I am planning on installing 4 SA-8 in a chevy 72 truck using an incrim. audio 40.1 amp. i really need help on determining what would be the best box type and size to include port size. i am planning to use the whole space behind the seat and install the amps under the seat.....your help is very appreciated...also would like to know who can build me box for my project.. Thanks Mike