Box for 2 12" Rockford T2's

[manbeer 0]

Doing a system for a friend with an Intrepid. He already has the subs and amp- 2 12" T2's in D4 config, and a rockford T2000 to power them. Lots of room in the trunk to play around with so this is what i was thinking: 5 cubes gross, single slot port appox 96 sq inch tuned to 35hz. Subs and Ports firing rear. Goal is primarily SPL and as long as it doesn't sound like complete ass he's cool with whatever. Listens mostly to rap. What do you guys think?