Thank you.
The challenge in the vert is space, obviously. Trunk sub would just push energy out the back anyway so we decided on a passenger custom foot well enclosure and a JL 10TW3-D4 for the sub itself.
The front of the enclosure will be color matched carpet, reinforced glass with the image below etched into it facing the passenger, and some LED lighting so you can see through to the sub there. There will (should) be enough room for a 6'2 person to still sit comfortably even with the room the enclosure will take up..... we'll shall see.