Wet N20 sys. are generly more safe. I have ran NX on 2 other cars but did not trust it on my 02 wrx or my sti.Only because of boost. The thing about wet on the sti is the mounting of the nossel in the throttle after the intercooler. That is not the rec distance from the throttlebody. I think 3 to 5 in. away if memery serves, is correct. Their is not enogh time for the fuel to atomize befor hitting the cyls. Yes it will burn just not to its complete potential. N2o or Co2 spray over the intercoller is ok and will build power. No it will not crack the fins or vains unless they is extreamly hot.( so i have seen) dont yell at me if it does!! Finally a 50hp shot at stock boost should be ok every once and a while.