hello, I need a box design for a 1999 ford ranger reg. cab... I think 40" is the longest it can be, I will try and double check that but I only have like 7" bottom depth and 3 at the top! It has to be ported or slot ported and has to be 2.0cu. ft. internal airspace for my 2-8" True Bass Audio's! Each sub has to have 1.0cf. so I will need 2cubes and the subs are dual 4ohm and the amp I finally went with was the Kenwood KAC-PS 811 D do you all think 4 gauge will be ok for this build? I believe the amp is 919rms so I am hoping I can put some of the 4gauge I have to use!! Please any suggestions are appreciated! Peace