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The business end on the oem plugs looks good from what I can tell. I can not tell much of a difference between oem and 1 step colder. I wonder if the the knock was so little that it would not easily show up on the plugs but was enough to see a gain from going a step colder on the plug. I may run this same test in the winter to see if I get same or similar results with colder plugs.
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