question
Some cars are close before mods, some are further off. So its debatable how much HP you will gain.
The ECU does some of its own adjustments, dosn't calibrate WOT, but tunes it in all the other cells, and knows weather to add or subtract fuel (fuel trims), this figure is used when going into WOT.
So you may gain 5hp, you may gain 20hp, who knows....
My .02





