Hey all, newb here! I just ordered a 12" BTL, so I have about 3 weeks to plan my build, with the biggest project being the box. I heard a while ago that in an SUV, a setup in which the subwoofer is pointing up, and the port is pointing back is optimal (straight from Memphis Audio), but yesterday I found a page showing tests that the subwoofer pointing back yielded higher SPL levels versus the same sub pointing up or even to the side. Which is correct? Does anyone have any personal experience with SUVs that can shed some light for me? I will probably be building the box to Fi's cut sheet dimensions, just need to know whether to put the sub on top, with the port facing back, or to put the sub also facing back. This definitely is not my first box. I have lost track of how many boxes I've built since I was 16 and had my first car (5 years ago) but I have never worked with an SUV! I just want the sub to be loud, and want this box to be my best yet. Thanks a lot!! P.S. - The SUV is a 2007 Nissan Xterra.