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Iridium's are terrible plugs for making power any which way you go N/A, nitrous or boost. A fine spark has inherent problems right from the start in a combustion chamber. When fuel burns in a combustion chamber you want it to burn all at once and completely. The fine spark of a platinum or iridium plug does not do a good job with this at all. A fine spark is more prone to blow out even N/A and does not ignite all of the fuel consistently a smaller gap does seem to help a bit but it still doesn't do a good job. So why do manufacturers use them, because they do last a long time and they can boast they're 100,000 mile tune ups. ie (marketing) NGK 4306 gapped at 0.040 N/A for mild boost Gap the NGK 4306 spark plugs at 0.032 The NGK 4306 spark plugs are full copper and have a very broad/wide spark which throws a much better flame. When gapped correctly per specific application allows your engine to see it's full potential. No spark plug makes HP on the same hand can cost you HP the full burn of a NGK 4306/copper spark plug helps in every aspect of combustion.