I put the Infinity Basslink 10 in and pulled the subs out and put some Infinity Kapa's 5.2's in place of the subs. Sounds real good. Still have a good amount of trunk space left.
Had it professional installed so I don't know about pulling the back apart, I do know that a slight mod was made to put those Infinity Kapas in place of the factory subs, but the mod looks like it has always been part of the car.
I have a thread on this forum board when you go back a few pages.