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From my knowledge, you dont have to worry about the shape of the box as the wave lengths for bass frequencies are quite large. The dimensions of the box in a car is alot smaller than the size of the wave lenght and therefore there is almost no chance of getting 180 degree wave length bouncing back to create any cancellation. All you should really worry about is the volume of the box and secondly the port(s) where if it is a vented box.
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