Box designs and questions

[Beginer]

If this will be your first box you can try to use http://www.subwoofertools.com/forum/ported-box.asp
Or http://www.reaudio.com/speaker_box/LPort_Box_Calc.html for 3D view :D
With these you can get right tuning freq.

[djman37]

or look in the sticky here to figure out box size using winISD.

[djman37]

??

Testing is the only way to know for sure. In a trunk, I'd try to keep everything as close to a single point source as possible; ports and subs on the same plane, near each other, in the rear corner. Reflection and cancellation starts fast in a trunk.
Flared ports would be my choice for a daily box. G/L.