yup, they are right. here is why. NOS is N2O, meaning 2 molecules of nitrogen and on molecule of oxygen per part. in its bottle, N20 is a liquid. when you release it, it instantly turns to a super cold gas, the nitrogen and oxygen molecules spit. when they do, the nitrogen becomes EXTREMELY cold (roughly -40 degrees Celsius) in the atmosphere and not only super cools the oxygen molecule around it, but all the other oxygen molecules that are traveling down into the combustion chamber! as i am sure you know, colder air is more dense, has more O2 in it, and can make more power. the biggest advantage of nitrous is its cooling effect. some pro racers even use just to cool the air from their superchargers. they never actually inject it into thier engines. n20 is better at cooling the incoming air than an intercooler could ever be. you could still make power by injecting compressed 02 into your motor, but the effect would probably be a fraction of what it would be with the nitrogen added.
BTW, i know all of this b/c i am a nitrous junkie!!:kooky: