470 going to the dyno - HP/TQ estimates

Why is that? To me it makes even more sense to use and tune that on the dyno.
I am really running it on the dyno to heat cycle a few times and check for leaks, then make a couple of pulls just as a baseline. Feedback from a few people I know that have dynoed sniper systems is that the engine dyno tune usually isn't that great in the car. I will probably have the car tuned on a chassis dyno with the full sniper system once all the bugs are worked out sometime this summer.