I sat in on the program at May Madness where they displayed the 5000. Quite a bit of engineering involved. There was no working demo truck, but I am convinced they are on the right track. One possible bump in the road is that it does NOT fit any standard exhaust manifold. A new one is included with the unit.
The 2 volute system seems to make sense, a small one to spin up the wheel down low, then open up the larger volute when compressor side reaches a point selected for your particular setup via a external adjustment. You can tune it to meet your own particular needs. It is a BIG compressor. I heard 50 psi mentioned several times.
No firm pricing was given, but $2995 was mentioned. A version for the 2G is supposed to be available in a few months.