RM's NOS kit was perfectly safe and there were tons of NSXs out there with their kit.
Fast and the Furious
NOS is a legitimate power mod for certain applications used in some professional racing. However, the film above was so bad, and so embarassing, that the repercussions on the community were irrecoverable. All NOS users must now cower in shame due to the unfortunate horror that was
The Fast and the Furious.
I believe that is what caused them to discontinue the product.