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Pure n2o is not safe for automotive applications because it has no odor. If you have a leak somewhere, you want to be able to smell it. The amount of sulfur in "nytrous" is so low, as to be insignificant.
also if you're worried about residue on the engine add NX Chemical X, it's a octance booster but it also cleans the engine from nitrous residues (don't know any more details)