Area under the curve (usable power) and max gain are two different things...
For max gain you want to see the difference the mods made on a specific car on a specific dyno. If one car has a baseline of 165whp and another has a baseline of 175whp it doesn't mean one is actually faster than the other, too many variables contribute to dyno numbers.
Don't look at the total number, look at the gain over stock to rule out dyno setup variables (assuming the baseline wasn't sandbagged to make the mods look better).
You also want to make sure you aren't losing power as well, and anything that narrows the torque dip will be VERY useful in daily driving as well.
As for the actual power numbers, I think it'll be pretty easy to get ~200whp with a header, full exhaust and tune. Some of the headers are giving very promising results (~25whp gains!)
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