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24 Don't forget to change the spark plus prior to running nitrous in your engine. To avoid detonation, you'll need plugs that are at least two steps colder than what you would ordinarily run. These plugs were provided by Zex, and not only are they colder, they have an electrode designed to throw a more efficient spark. Also remember that you must dial back the timing--in this case, by four degrees--again, to reduce the risk of detonation.