Sweeeeeet! I just saw the pics of the installed supercharger. Andy rules.
As far as the numbers go, check out the FX 1/4mi time thread. When that stage 4 kit was on my old rwd FX it *only* made 326hp at the wheels, but even then with the worlds heaviest 22" wheels (Axis Mulliners) and 305 tires it was almost a full second faster in the 1/4mi than a tuned FX45 with 19" racing wheels...
It may not seem like much as a peak number, but it is deceptively quick. The NOS charge cooling will help a lot too.