i did this car about a year ago, it has 4 12" earthquake dbxi's in a ported box that replaced his back seat. the box is a functioning back seat and is quite comfortable!
head unit- eclipse cd3200
components- 6.5 & 6x9 earthquake v-tek
highs amp- earthquake ph2200w/4
subs- earthquake dbxi 12's (4 of them)
sub amp- ph5000w/d1
batteries- yellow top up front and red top in the back
alt- stock for now
half volume
half volume