Got 4 of these to replace the OEM NGK Platinum "7" heater plugs as my Honda S2000 is supercharged. These "8" plugs came about .030" apart from the factory; I increased them to .043" for my car. They work great. I've found that my low end has improved a lot since my ECU no longer slows down timing due to slight pre-ignition There is no difference elsewhere and was not expected.
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