NGK Iridium Spark Plugs Heat Range #6Why NGK Iridium? NGK IX Iridium Series plugs were designed specifically for the performance enthusiast. Fine wire centre electrode ensures high durability and a consistently stable spark. Iridium alloy has an extremely high melting point, perfect for today's high tech, high performance engines. Please Note: Iridium plugs are able to use larger gap setting with less voltage. Some customers choose to re gap these plugs to correct misfiring or tune for
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