i have a 1997 silverado extended cab. i have seen up,down, front , and back firing sub boxes under the seats of these trucks. i was wondering what is the best if i was to run 2- 12" infinity kappa perfect 1600watt's? ? or are those not good subs for this truck? and would the box be taking all the space under the seat and go all teh way across or would 2 seperate boxes be good? where can i find the dimensions to build a box? i know 3/4" MDF rocks, but what screws and cauck are good?