well, NOS is a brand name. nitrous is the slang term for what you are referring to, Nitrous Oxide (N2O). I've personally never used it, or ridden in a vehicle while spraying. But the idea is simple.. cram some supercooled oxygen into your engine, some extra fuel and voila, instant power gain. There's no reason why you can't use it on a stock engine as long as your fuel system can deliver the goods and you're not exceeding the power capabilities of the mechanical parts of your engine. 200whp+ is definitely doable on a b16