im planning on just farting around with my spare time to build an spl box for my 12" FI bl. my daily box hit a little over 140, so im wondering what kinda box setup would work well with the res freq. of a 97 4runner. the amp im using is a hifonics bx1606. any suggestions on size of box, port area, tuning? ive never really built an spl specific box, so im a newb at this stuff. thanks