I have 2 hifonics golaith 15's XX2415. Its goin in a 1989 Caprice Classic, so i have plenty of room for just about anything. I also have a Hifonics XX Colossus II amp.

Just need some help with the design and all. In the manual the it calls for 3.5 Cubic ft per sub slot ported enclosure.

Any box designers out there that want to help me.

Thanks alot.