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I have two 15" in a 5.5 cube ported box, 2 12" subs BNIB, and 800 watt amp, B&D booster pack with compressor, mag lite, coolant, oil, fix a flat, full size spare, a 12" Brahma, tow strap, and a 24 pack with 4 beers left in my trunk.
I have 2 12" MTX subs in a 2 cu.ft. Q-Logic Box witha JBL 1200.1 amp and a 1 farad lightning audio cap.. Its a tight fit to get it into the trunk, but once its in theres room to spare. My box is one piece, but it might be easier if you buy 2 boxes so that ur subs have plenty of room. if you do have small boxes, and their not ported, add a lb. of polyfill (used for pillows, $2 at walmart). the polyfilm will make the box "trick" your sub into thinking its in a bigger box.