I don't "need" NOS. But my brother gave me the kit for Christmas several years ago, and I couldn't sell it for half the price, so I figured I would install it for looks, and maybe someday, hit the button.
One word. Thunderbolt. Lowering intake mixture temperatures can be just as beneficial as implementing larger/higher flowing air cleaner elements. Sometimes even moreso at lower speeds and in certian engine bays. Ram air never hurts matters either. And combining all those tricks is the absolute best way to go if you have the time and money to implement it.