Both!!
I am just curious about it is all, for my own personal use. GPX is supposed to be 200bhp standard, but I don't think it is. Hence why I'm not sure. .
Everything you have said has crossed my mind as well. But as I do mods to my car, given my car is mostly standard now, it would also be nice to have a base figure to begin from. IE, I bought the car and it was running at 136bhp and now I have done this this and this to it, its now running at 176 bhp. . Instead off, its meant to have 200bhp, and now I have induction, stainless exhaust, decat and nitrous, and then put it on the rollers for it to only run at 176 for example. I wouldn't know what the real power gain was.
Does any of that make sense?
Edited:
Just as you said here [now I re read it]