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Message: <blockquote data-quote="vr2turbo" data-source="post: 1064646313" data-attributes="member: 92229">As far as I know, cooler heat range plugs just helps removing heat from the combustion camber, so as not to overheat the plugs. When they becomes too hot it will cause pre-ignition. Unless you have gained 75 to 100bhp change, then use a colder plug by one number. If not, just use the same heat range. My 200bhp 4G63T uses number 6 only.Friend told me if want to find copper number 7 plugs can try motor cycle shop, as bikes uses colder plugs, but make sure same size, especially the length.Platinum and Iridium material are higher heat resistance only. I don't think you will get additional power but they do last longer as they are tougher so wear resistance. Copper electrode will get rounded off. Platinum and Iridium tips are hard and very fine (small) so they hardly wear.</blockquote>

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