that'd work better, reduce rattle, but he's still gonna have to reinforce the trunk lid, and possibly get a better lock depending on how close the sub is to the trunk lid....but i've seen trunks pop from subs being faced towards the back as well....LOLIts going to rattle a lot more. Can you make a slanted box?
put the front of the box where the sub mounts on a angle it will allow the mounting face to be longer.
Like this
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