Max gain generally refers to an increase in power in a certain portion of the RPM band which is referred to as "usable power"
You definately want to be more concerned with increases in useable power over max HP
Max HP is just the highest value the motor produced.
IE a 600 whp BRZ is cool to have but if the maximum gain (usable power band) is from 7k rpm to 8k rpm it's pretty useless.
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