I believe its an aero at 6 inch...honestly I didn't measure it though...I was talking to the guy about building a box and he had that one already built...he swapped my subs over and I hooked them up before I bought it...it sounded great and I paid material cost for it...it was kind of a win win...
I've got my front doors done dampened inside the door cavity already...I'm planning taking the plastic door cover off and doing plywood instead so I can have more options on what I can mount and it'd have the upside of more solid mount...it won't be pretty but that's really not the goal anyways