New Build, need help with Aero ports!

[AGuyWithAJeep]

I plan on putting 2 Fi BL 15's in a 2002 Grand Prix. So far I have planned to put in a box that is 16' High, 36" Wide and 34" Deep. Totals out at 9.41 Cu Ft without displacement of anything. I planned on using aero ports, i want the box to be tuned at 31 or 32 hertz. I'm new to the whole aero ports thing, but what i got was i would need 3, 6" Flared Aero ports that are 21.5 inches long (each). Does this sound right or did i completely do this wrong? Like i said i am new to this and have little idea on how to do this. Thanks!!

[agf144]

there is no way in hell that will fit trust me i own a grand prix. it is possible to fit 2 15 in the trunk ported but that will use alot of the trunk and will have to be built in the trunk... and 9 cubes is a bit to much try 7.5-8 net.

[ChevyBoy95]

you pretty much spot on, comes out to about 7.9 cubes, with 32hz tuning. I say build it if you can fit it.

edit: this was 1 layer of 3/4 inch MDF all around. You could add some bracing and be fine.

[agf144]

so then im assuming subs up port back then? or u could utilize the space after the wheel wells and make the face of the box wider to fit the ports because not everything will fit on the face as it is. and add a 2nd baffle which should compensate for the space gained and add strength.