"So the point Im trying to drive home is in relative terms aiming subs up in the trunk sucks. Especially when you can aim them towards the rear (sealed) it will seem twice as loud or more. Or aiming them to the front ported, which is the loudest."
That depends strictly on the vehicle. Some cars like subs up port back. But you cannot simply say that all subs up in a trunk suck.
In my experience with the Alero, I have a .8 db gain by facing the sub and port forward than having it all firing towards the rear. I gained another .8 by popping the trunk
