For sure...all my mods and everything I do is approved by the RAC and underwriting. No problems here, the day they ask me for a dyno chart(say when I change turbo) or hp figure I will happily provide,RAC is awesome for Wrx insurance.
my question was more out of curiosity to try understand if they cared about the hp only past manufacturer hp...sort of option b is what most people get asked after
tbe and answer like said above unless its making over the manufacturer figure.