Question about port

So how do you figure out what size box to start out with, Im using online calculators and you need cubic ft to find port size but then the port size and length is going to change the cubic ft. of the box

 
So how do you figure out what size box to start out with, Im using online calculators and you need cubic ft to find port size but then the port size and length is going to change the cubic ft. of the box
some builders use the torres calc ,others pay for one

 
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MikesJeepTj

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