Nitrous Oxide in my opinion is a legitimate power adder. Even cam science has developed around the principals of the gas. If you've never played with it you are missing out on a real good time.
My mission in life however, is to ban the use of NOS as the generically used lingo for nitrous oxide. Mike Thermos founded Nitrous Oxide Systems in the late 70's/ early 80's and did a great job of promoting his company, but we were kicking butt with other engineered systems at the time. His plates froze up, and had a few other issues. I know they have developed well over the years, but those early years slugging it out with them at trade shows left a bad taste with me.
So call it N2O, Nitrous, etc but NOT NOS, unless you specifically mean their system.
Rant over.
No disrespect to poster above, but what if you CAN build and tune, and still elect to add nitrous to a great runner? Cheating?
Especially with cars we need to drive around on 5 dollar gas. You can make it so radical its making 500 hp but is no fun to drive, or make it something you car run errands in, then go like heck when you want it too. It's not everyone bag, but it has a place in hot rodding.
What ever you do, I guarantee hitting the button on a nitrous car will make you smile over and over.