back in the day when I had my fox I had a texas wedge with 4 10's in it with a amp rack, taking up the rest of the space in the floor, but with 4 10's its gonna slow your car down with to much weight, why don you do 2 10's in a glassed wheelwell inclosure with mdf on the top and carpet the mdf... and build a amp rack to go against the rear seats. nice and clean and you can still use your trunk!