new build, spl

Im building my first real system.  Ive bought a sundown 4500D and a sundown 100.4 . Im planning to run 4 american bass xfls 2/2s. Im in a suv, so ive got a lot of room. I need help with the box and if I buy 2 more xfls, a 4/4 a total of 6  my amp will be at .8 ohms. what do you think? its only  1 ohm stable. Ive got 3 xs3100, a xs3800 under the hood and a 250 amp alt.  I want spl. any info, or opinions will be awesome!

what does everyone think of american bass xfls [12s] ?

what does everyone think of sundown 4500d and 100.4?

i got a AB 12" cx series it 10 yrs old but instant differnce when i hooked it up, better then the 12" cvr if i were doin abuild like urs , i would go with them xfl's, theres 4 crossfire bmf 15's 1.8 ohm dvc with 8 ga speaker conn. at this shop i deal with, ther old but never been used there also hid pretty gd so no one else sees them,lol cause theyd sell them selves to a hardcore audio hand1000 watts of lp, now need sum hp an mids