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If your friend wants to play it safe then he'd better get some colder plugs. The NGK's you mentioned is what I currently use and I know of a lot more people that prefer those plugs. And I hope he didn't advance his timing while running the nitrous, you NEVER EVER want to advance your timing if your running nitrous. Retard your timing to play it safe but NEVER advance!!! Using colder plugs and having your timing retarded a few degrees is just pre-cautions for your engine. I've seen too many people put in nitrous kits in their cars and blow their motors cuz they didn't do their homework and tuned it the proper way.
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