ported box

That sub might displace close to .2 cu ft.  But here's the thing about working with a sub whose tested parameters are not published and available:  you are working with a sub whose purpose is nothing but SPL.  Gleen what info you can from the manufacturer's published data;  e.g. that it can be used in a small box.  With emphasis on "3000 watts", Pioneer is clearly marketing this sub for street SPL.

I would venture to say that if you did have the tools and resources to test this sub's parameters, you would arrive with a set of numbers that would confound you when you plug them into WinISD.  Audiobahn, too, has several sub models that you can't work with in a box building program.  What is confounding is that when you are attempting to arrive with some kind of decent Q in the design of the box, you find that the port has to be 3/10 of a mile long or that the box should be 12 cu ft...things of that nature.  Confounding things.  There is likely good reason why Pioneer isn't publishing tested data on this line of subs.

So you should use all the resources that you have available to come to some sort of conclusion.  First, you have the limitations of your car's available space.  Then, you have a sub that wants a lot of power applied, so think about building double walls and braces into the box.  Also, consider available space for the port structure (the recommendation of a round 3" port with a short length is a clue that the sound from this sub probably won't be hurt too much by port noise.  Remember, it is intended for SPL, not sound quality).  But consider using a larger port opening area and thus a longer port length anyway so that you are not intentionally permitting added noise from the port.  And I'll add that a rule of designing rectangular port openings is to make them as square as possible.  One inch wide is too narrow, regardless of the corresponding length.

Another resource, and one that is perhaps used most often, is to look at what everybody else is doing with this sub model.  You'll find examples of 2.5 cu ft per sub (at least I did when I did a search).  Whatever you come up with, allow the generous thickness of baffles and added displacement of port structures to your final product.  You will eventually end up with a monster heavy box, even if the net internal volume is just one cubic foot.  And give the sub plenty of power.