Sorry I got banned for a week cause an admin put a giant avatar on my profile. But yeah I got my dimensions for my trunk: 35wide,17height,30depth. I let a volume calculator do it for me but I got 8.56cubes with those dimensions. Also if i extended the back of the box to have a wedge area (extend the bottom depth keep the top depth the same) I can get 9.76cubes. So with that it opens up some options. I believe I can go with 2 12", 2 15", or 1 18". My only concern is with 2 15" it might be a lil too expensive. Ideally I dont think I want to spend more than 600 on the subs alone