I am toying with the idea of putting two eights in my rear deck, running a custom enclosure, fiberglass framed on pvc, and then porting it into the rear seat pass through. Does anyone know how much flexibility there is in port length and width, so long as the volume is the same? and will there be any adverse effects of a cylindrical enclosure? What are some really bad ass eights? koda 8's....any others. I am looking to replave my subs in the trunk, so I need the best possible low end and as good spl as I'll get from eights