Fi Sp4 15" on 3k. enclosure?

[cloud77 28]

So I'll be running my SSA Zcon 12" on 3k for now until I get around to purchasing a recone for an sp4 motor I got in a trade.  My problem is..I have a trunk car and limitations on box sizes.  Depth and height are a problem for me.  I have come to the conclusion that the biggest I can fit is an L port enclosure about 3.9-4 cubes.  If I give it about 4 inches of port and still have net, will this enclosure server well to the sp4?

 

I'll be running 3k @ the sp4. 

 

If not recommend what you all have experimented with.