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Iridium Plugs-crap Or Real Deal

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SC300 Question:

I've been wondering this because the owner's manual for the SC300 states to not use any other type of spark plug except for platinum yet i see on ebay there are plugs made of iridium for SC300s that promise more HP. Also, the manual states to only use platinum plugs that have dual tips yet these iridium spark plugs are single tipped. Is a single tipped iridium plug safe to use on a SC300?

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