Honnestly, I think you need a better box, made for your trunk, and your car.
The SSA ICON is a fantastic driver (I've owned Kicker L7, Icon, SSA Xcon, SSA Zcon, Fi btl N2, Pioneer subs,...etc).
2 would shine on a 2000 watts amp.
A single 12" Icon or Xcon (more output) in a ported box should give you what you need on that same amp.
Good luck.