I actually had a box exactly like that, verbatim like that. It was 1.5 cubes at 28 hz, 24 square inches of port. I had a DD 3510 in there, and then a HDC310a in there. The HDC3 liked that box better. This was in a 03 F150 extended cab.
I've found that in my truck that up firing was louder than forward firing with side port, but yours might be different.
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