"Technically" you are right Rubberducky, but in the end ultimately wrong. When you inject N2O into your intake it is true that you are not pressurizing your intake mainfold, or forcing more air into the engine from the atmosphere. What you are doing is adding massive amounts of oxygen into your engine, thus requiring timing retard and added fuel(two things you HAVE TO DO ALSO WITH FORCED INDUCTION). So, yes, it isn't, but it is. :p