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Did you look at your stock ones before you put in those 97506's? My stock ones that were running the OTS e30 map, looked the same, black mark on side. I think its just where the flame front ignites, nothing to worry about, as long as the electrodes look good. I'm running the same as you now, 97506 @.021. Haven't pulled any to look at them, but the car is stroooooong.....
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