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^I agree if you have the right plug then that's about as good as it gets. Now using a poor plug could negatively affect things, for example I put E3's in my s10 and had stumbly idle and poorer performance it seemed. Mpg also seemed slightly lower, I switched to the stock plugs and ran normal.

^In addition to what he said, heat ranges can make a slight difference in power I believe also though.
 

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Use Bosch, Autolite or NGK. Copper core on the top bank, Iriduim on the lower.
 
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