n2o is not a form of induced induction, you are not pushing (compressing) air into the chambers, what you are doing is introducing nitrious, which is introduced into the intake tract of an internal combustion engine, the effect is like a super charger or increasing the compression ratio of the engine.
n2o has more oxygen by weight than the atmosphere, the nitrogen reduced the temperature of the engine, thus weilding 25-35 percent more power using a small shot.
the compresion is increased, air is not pushed into the intake tract.
this is a common thing for people to get confused, technically nitrious is not a form of induced induction.
read more at,
http://www.idavette.net/hib/nitrous.htm