4 re audio sx 18s or 8 alpine type r 12s..

I don't have a measuring tape but this is the specs I got online Cargo Area Dimensions

Cargo Area Length @ Floor to Seat 1 (in): 77.8

Cargo Area Length @ Floor to Seat 2 (in): 52.2

Cargo Area Width @ Beltline (in): 61.4

Cargo Box Width @ Wheelhousings (in): 49.4

Cargo Box (Area) Height (in): 40.8

Cargo Volume to Seat 1 (ft³): 118.2

Cargo Volume to Seat 2 (ft³): 66.9

 
You do realize the cargo area is still pretty small for 4-18's bottom line is the 15's are a much better route and I know for a fact you will be happy with them.
says the person with 4 18's //content.invisioncic.com/y282845/emoticons/uhoh.gif.c07307dd22ee7e63e22fc8e9c614d1fd.gif lol

 
here's a picture of my setup for whoever was asking

IMG_20110905_173519.jpg
[/img]

 
it does around 2 db less on the meter having sub up port up as opposed to sub up port back, but to the ear I can't tell a difference.

also, from my experience having a brace is about 15x better than a double baffle. also made of birch plywood not crappy mdf board.

 
Finish Him! (Shang Tsung's Voice)

Anyway, I would say do 4 15s as well OP. You still want to have good air flow... Or 3 18s... I would go with the XCONS or Death Penalties out of those. The SX are very nice subs, but not in the league of the others.

 
As a general guideline you want to keep the woofers as low as possible and the box as far away from the rear gate to maximize pressurization..

Too tall and it traps pressure to deep and it traps pressure..

not only that you have to design the box for maximum air flow(least resistance as possible)..

Keeping the cones close as possible and the rearwave in phase as much as possible..

Trust me when I say 4 15s is the best way to go..

Give me some measurements and I'll be glad to help you design a box and find some woofers that will work great..

 
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