Sci-Fi,
So the 7570 is a hotter plug...but what does it do differently. I got rid of any hesitation by going with aftermarket intake, exhaust and the 7440's. It'll spin the tires from a stand still and go right on up to MX-5's burp-free modification with no problem what-so-ever. I am happy with the 7440's and as I said just received 6 (ordered 4)new ones to have on hand for the next change.
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