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I can't see spending $10 on a plug when I can buy Autolite AP63's at about $7 a pair. I can't see those $10 plugs ran any better than the Autolite plugs.
Leo
As far as I’m aware the iridium just wears less meaning you don’t have to gap them as often and they last longer. Supposedly they burn a little hotter, but they are The same heat range so I don’t see that as a valid issue. It’s mostly personal preference as far as I’m concerned. They are still ngk.