2 sx10's need help with final ported box

[myvanpounds 10+ year member]

hello I have 2 10" re sx's I had them in a small sealed box which turned out to be .9 cu/ft so i'm on the quest to build a ported box. but here the problem. its gotta fit in a dodge stealth. so I cant go to big but I can't decide on how big to make it and what to tune it too I know I'll be using 2 4" ports no mater what. but heres some of the boxes i'm thinking about:

2.1@27

2.3@27

2.5@30

3.0@35

3.2@32

I'm loking for SQ now as all of these boxes are louder than the sealed box . so the most important thing is it hast to sound good for a daily driver

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[req 5,000+ posts]

id try and hit 3 cubes, and tune round 33 if you can. mount the subs on the top, and put the port in the back firing horizontal at the rear trunk area.

would be quite loud.

 

[myvanpounds 10+ year member]

i'm not worried about spl at this point after hearing it sealed with 1800watts I want more SQ now cause when I run the numbers in WIN isd i get a nasty spike when tuned above 30hz but when tuned lower it flatedns the response out a bit and bosts the 20hz range

I use the .9 sealed box as a base line(red)

the green is the 3.2@32 recomended

and the yellow is the 2.3@27 which smooths out that peak and boosts the low end a bit