I, like many, am not satisfied with the amount of bass in the HK system. I have seen the stealth upgrade that ImportShark makes a think its an awesome option. However, it definitely is not in my budget at ~$1700. I was wondering if anyone had recreated their design in their own car. Specifically, the box is what I have questions about. There is not just a ton of space in that hole and they advertise that it is a ported box which I would assume would need to be >0.5 cu/ft for any sub. I feel like there is no way unless counting some of the space in the fender as volume? I already have an 8" sub and an amp to power it. If I can't make it work over there I may just settle with a little loss of space in the trunk.