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32,667 Posts
I spent a few dollars on esoteric plugs over the years, all dragstrip tested, looking for a little more performance just for fun. I never found any. The trap some fall into is they see an increase after the plug change, but this is only because the old plugs were not in prime condition and needed replacing anyway. In other words the same benefit would be obtained by replacing the normal old plugs with normal new plugs of the same variant.