Can I get some help designing my box

[57hemi]

Hey guys I wave a 2009 jeep grand cherokee, I measured toe space I have to work with or what I'm willing to give up. The total volume is 5^3 ft. I currently have 2 MTX t812-22's. I wanted three but I don't have the room..... crutch field says I need min of 1.4^3 and mtx site says I need 2^3 with space for port. Minus the .5 cu magnet and basket. How do I get the right size box without any special gauges?

12 volt said I could use a 3"x5" round port or a 12"x2" square 8" long.......does this matter?

I could make it a bit bigger in depth to fit 3. Should I go with 3 at 600w at 1ohm or 2 at 550w at 2ohm

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