I'm a little hesitant to spray, since 2005, I've gone through 3 boat motors.lol I used to think that the main way to go wrong(with nos) was to be too lean. A few months a go there was a thread that said too rich was just as bad. I have a set of dry headers and a wideband and was wondering if the std. a/f #'s would apply when the nos was on, or not???? I realize there are a lot of other variables(timing ect). For argument/discussion sake here lets say it's a 200 shot.