OK, so ended up with a Fox acoustics ported enclosure with a 10" Image Dynamics (almost got a Diamond Audio) DVC 4ohm.
Not broken in yet, but initially of course worlds better than the OEM sub. Frankly its crossed over too low and the driver is too small and is in a tiny sealed enclosure.
Hits pretty hard, grabs the low end the Factory sub could never see. Of course will never be over driven. Also thinking based entirely on the amp barely being warm, that may have been able to do dual 2 instead of 4 ohm.
The box does take up the space under the drivers rear, even stuck out a bit, so I took the plastic face plate off the storage piece to get more room. Wish it was smaller...
Anyone know the Part No for the wire that goes from the amp to the sub? its a 4 wire, red, green, black and white harness. Cut mine and like to be able to go back to stock at some point if I need to pull the box for a road trip or something.
Also not sure which is pos or neg either, assuming the line holds that all wires with stripes are neg, then the red is neg and black is pos, green is pos and white is neg, seems off to me.