box design $ from proven builder

whats goin on looking for something different to put in my girls car lol im thinking 4th or 6th but space is limited so if u have experience what gets loudest for ground pounding

1. Car. Year, Make, Model:

2010 nissan altima

2. Subs. Make, Model, Size, How many:

3 xfl 10s

3. Power. How much power per sub:

saz 2500 @ .67

4. Goal. SPL or SQ:

spl but music orientated

5. Sealed or ported:

both 4th or 6th if possible

6. Sub/port placement:

you tell me

7. Max dimensions:

13h 32 w 35d

11) Additional comments:

thanks keep it fair for design price

but creative & proven lol