So I built a fiberglass sub box for my 350z to fit under the strut bar knowing it would be too big. But, now I gotta figure out a way to remove .4 cu. ft. I could obviously just fill the box up with wood blocks but I'm not trying to make a boat anchor. So instead I was thinking I could just put some triple expanding foam in there. Not sure if this will work to effectively decrease the volume of the box though? Need some help.
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