Alright, in my quest to eliminate rattle in my Dodge Charger I've decided to do a forward firing box sealed from the trunk. The sub is a single Fi Q 12" powered off an MB Quart 1500D. It will be in a 2 cubed box tuned to 32 hz. However, I'm intrigued by what I've read about 4th order bandpass boxes. I'm thinking of having one built and firing the port through the rear factory 8" oem sub opening directly into the cabin. With this set up, will it still have to be sealed off from the trunk to eliminate rattles? I guess what I'm asking is will the bass be completely channeled through the port. That way all I would have to do is seal the port itself off from the trunk into the cabin?