Again, like most of the time, the problem isn't really to buy or build a 1000 hp car, but to get it insured and put it on the street legally is a big problem.
And emission testing at moderate rpms? I don't think so, they just floor the pedal, the car goes into such high rpms I wouldn't trust to do on the road. But apparently a car should be clean enough in states it should never be in on the road.