The problem with that prefab box is that it's not even 3.5 cf. You need 4cf for just TWO of your sub's. That's why it's being recommended that you get a custom enclosure. At this point, you should forget running 3 and just do 2 sub's in a nice box. Sell one and put the funds toward getting a nice enclosure shipped to you.ok now we have a problem i might be having to lessen the sub box size because i might be having another mouth to feed and with that comes needing more truck space
the subwoofer box i used to have was this Ground Shaker GSP312 12" Triple Ported Subwoofer Enclosure Box GSP 3 12 Black | eBay
and it left me with reasonable room in trunk, would it be smart to get a custom box made with the same Measurements
That being said, you should be able to fit 2 12's ported in a Crown Vic with a good amount of room left over. Those trunks are pretty big.
