Here i copied a good post from another site, so you young kids dont sound so stupid, I bet you think dirt bike hae a power band that kicks in too.
"N2O is absolutely, 100% NON-FLAMMABLE. It cannot burn, combust, ignite, or explode by itself. but, it does have some interesting qualities that make it work so well for horsepower junkies. Here's how: When the nitrous is in the bottle, it is under a LOT of pressure, usually around 1000 psi (the pressure is why the bottle could explode, NOT because the nitrous is explosive -- 1000 psi of ANY gas could be a bomb). The first thing that happens to the nitrous when it enters the engine is that it very quickly goes from a liquid state to a gaseous state, and that process absorbs a lot of energy in the form of heat (an endothermic reaction) -- meaning shit gets real cold, real fast -- so the first thing it does is "refrigerate" the air in your intake, which is a Good Thing. The next thing that happens, is that when nitrous reaches a temperature of around 250 to 300 degrees F (can't remember the exact temp, sorry), it dissociates -- which means instead of being nitrous oxide, it is now separated into nitrogen and oxygen, the two elements that it is made of. So, before your spark plug ever fires, it's no longer nitrous oxide, it is now pure nitrogen and pure oxygen. This is the second and most important Good Thing. The extra oxygen combusts with all that extra gasoline that's injected with the nitrous, and makes the engine act like it is much bigger than it really is. Also, the extra nitrogen goes along for the ride, with some saying that it does a great deal toward warding off detonation, which is a Very Bad Thing, and another, even more technical discussion.