Aaaaaaah the perennial question. For the most bass impact inside the car, it's been determined that the back deck must be used somehow. Now HOW exactly, is a matter of taste.
Sealed boxes gives nice tight, hard, bass, but bandpass provides more deep thump. So, MAYBE a banpass in the trunk, ported into the car through the back deck?
Basically, there is no one answer to your question.
Right now, I'm trying to mount a sealed box under my rear deck with the sub firing into the car. might work, might not, never know until you try.Try shopping around to hear what other people's setups sound like.
--Good luck [img]smile.gif[/img]