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well they foul my plugs and my car runs like crap. when i put the stock on it runs very clean. i talked to my friend and he said if they are fouling then your not getting enough spark. and these are still brand new
The diameter was to much. (9.3mm diameter) You will not need that much till you push alot and i mean alot of power. But try to stick around 8mm if you have a lil bit done to you motor. If its stock and trying to get a lil better spark stay at 7mm. And all will be good.