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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1519413" data-attributes="member: 29141">You don't really need iridiums unless you are determined to extend the spark plug change interval out to like 100,000 miles. That's really all they're good for. They don't add any performance.If you're determined to do nitrous, colder spark plugs will be needed, and recommend it's a wet jet nitrous system. You'll need a dyno tune to make sure the car never leans out under load (and especially under nitrous load), and a means to monitor it like a wideband gauge and better yet a lean protection module.If a car has merely sat for a long time, your ignition system is probably fine. Those components deteriorate under mileage, not time. But the oil, oil filter, fuel, and fuel filter will need changing as well as the brake fluid. Wouldn't worry about injectors unless there's actually a problem. Cross that bridge when you get to it or you might be needlessly spending money and time on things that are just fine.</blockquote>