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I have no clue what the air volume is. It is fiberglassed to fit right in the spare tire area of the trunk, so that should give you some estimate....
It is shared air space.
i would estimate that box at around 3 and half to 4 cubic feet. three tens is a great combo and if it fit three w6 tens it should be deep enough to fit most others with ease.
nice looking box. is that floor peice included? that part makes it look a lot better (although relatively easy for a DIY type guy to reproduce himself).
good luck with the sale. i would expect this to get swooped up quickly considering i charge $650 to do that to someones trunk at my shop....