I'm pretty sure the HP numbers here are not BHP, WHP or FWHP. They are more inline with the theoretical compressor capacity which can translate to HP. Which is not a bad way to rate a kit given that cars and condition can vary vastly, hence the reason why GTM listed a few different installation setups in their
PR to give a taste of what it is capable of.
Looking at their prior StageI press release and the independent installations of it, I don't see any reasons to doubt their ratings.