I thought about getting rid of my dual 10" glass-facing sub box to downsize to a single 12" that pointed towards the front...but in the 2+2, it's hard to find a box that doesn't stand taller than the rear seat. I might have to build one when I have the time...one day. Good luck with your setup...looks great.
-Brad 1992 Z32 2+2 NA 1986 Z31 Coupe NA (For Sale)