Well Burrita is right about the ice. Being that it was 105 in the dyno we didn't feel like it was too much of a comprimise to lower the intake temperature a bit. I was doing about 260-270 without ice to answer your question Bret.However you need to remember that even though the dyno has a correction factor, I can only add so much timing with the heat.
As far as how much power this turbo will put down max I don't know. These are rated at 325hp but what does that mean? The mass of the air will change with the temperature so I can only assume that the max horsepower will change as well.
