Below are the specs for the sub I'm going to be getting this summer. I'm not the best at calculating the box diamentions and what not so I thought I'd let some pro's help me out.
I'd LIKE to try ported but space is at a premium for my car...

recommended ported is 2cu/ft tuned to 30hz
recommended sealed is 1.3cu/ft

Max width is 40"
Max height is 17"
width, prefer as small as possible

Qts: .45
Qes: .48
Qms: 7.48
Fs: 23.29 Hz
Re: 2.81
Vas: 55.79 L
Mms: 257 g
Bl: 14.81 T*m
SPL: 83.50 dB
Sd: 556 cm^2
Xmax: 28.75 (Physical Linear) mm
Voice Coil: 76MM mm

Magnet Width: 7.50"
Cutout Diameter: 12.00"
Mounting Depth: 10.05"
Weight: 45 lb
Total Height: 10.05"
Displacement: .12 ft^3
Outside Diameter: 13.00"

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Model of the sub?

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Deck: Pioneer DEH-P8600MP
Ipod Attachement: Pioneer CD-IB100 Ipod attachment hooked up to an 80GB iPod Video
Speakers: CDT CL-60CV's
4 Channel Amp: Kicker KX350.4
Subwoofer: Alpine SWR-1242D in a Custom Ported box, tuned to 32hz
Subwoofer Amp: Kenwood KAC-8152D
Wiring: 2AWG to subwoofer amp, 8awg to 4channel amp, seperate runs.
Oh God...

eD 13av.2 dual 2ohm VC's

__________________
realizing i'm just an ordinary guy with dreams of excellence. day by day i want to change what i am for the dream of becoming my dream