I got 2 sa-12 dual 4ohm going in my 2001 grand am . I going to push them with my RockFord Fosgate T1500.1bdcp . I really would like to fire the sub forword and port it up throw the rear deck with one large port I have some room to work with 32w x 16.5H x 15D I would like to tune it about 32-37 hz. Any ideas.