A '12 where the spare tire is in the 370z

RonRizz

To put the box inside your spare, and keep it below your floor level would more than likely not be enough air space, without raising the floor to accomodate it. You would definitely be limited to a shallow mount sub as well, and have to take into consideration the displacement of the sub itself. Soooo....
A box built to fit inside the spare, and stay below floor level will only be approx. 3.5 to 4" deep overall and 15" in diameter, giving you internal volume of approx .5-.6 cu ft tops. Deduct for your sub displacement, and you need a sub that will play in .3 to .4 cu ft. Tough task indeed, and probably not your best option.

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punjabiZ

^^True, when I made mine I think it measured at .3 cu ft. I had to raise it up 3-4 inches i think to get it to ~.75 cu ft.
Its not that hard to make a fiberglass box inside your spare tire, just take ALOT of preparation and buy more materials than you think you need. extra unused stuff can always be returned.
first time i tried something like this...