I can think of several setups that would be much better than the 34" Audiobahn. I can assure you that many people would agree. Do you really want to be rolling around in a hearse w/boom. If money is no object then I would suggest maybe buying a different car, and putting a nice system into it. Don't get me wrong that sub will definitely put out some awesome SPL, but I don't think it is worth the hassle. I have never heard it myself, but seriously what would you much rather have:
1) A system that you can only play when you are outside the car, because it is too loud for your ears to handle, and not to mention the bass will probably sound a little muddy, and it would be like your in a hurricane with all the pressure the sub produces.
or...
2) Have a nice quality SQ/SPL system, that you can ride down the road with, place very good in comps, not to mention probably have one of the best systems in your state.
I would personally go with 2, you don't neccesarily need a huge sub, to have the a great system.