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Sorry, my error, was thinking of another setup. Just looked at the numbers again, XE 256 does show a tiny bit better than Voodoo 60101:
XE256 Voodoo60101
HP 432/5500 426/5500
TQ 454/4000 453/4000
As others have pointed out, DynoSim somewhat optimistic, especially on torque figures, take it FWIW.
Dyno simulation programs arent able to truly compare cams that are close to the same size.
There is no way to plot the whole lift curve. There is more to a good cam design than just the numbers on a cam card.
The Dyno sims are good for a guide, but as Driveshaft relates, they can not be 100% accurate. The differences between the Voodoo, the Comp XE, and the generic cam will be all but unnoticable on a street car. You would probably see a difference in ET or MPH on the dragstrip, but it would be miniscule - perhaps a tenth or so. Nothing you would feel on the street.