No it wouldn't? There's no rear chamber. It's just a sealed box with one of the subs inverted...if you wired one out of phase, jman would be right, it would act like an isobaric enclosure
there's plenty of pressure, it's the same as if they were both side by side on one face of the box, except you're probably going to lose some low-end response, because the sound waves are going to couple weird unless you put the box sideways in your car
and btw, reversing phase is hooking up positive and negative speaker wires in reverse
that's if they're out of phase of each otherhow could their possibly be any pressure if they are both moving forward and them back word and the same time.
this would create 0 pressure