E3 plugs

three words to sum it up, inconsistent spark pattern. There is no spark control with these things, they scatter the spark pattern all over hell and beyond making it impossible for a flame kernel to burn the same everytime it fires. bosch platinum 4's, and 2's do the same. Working at NAPA, I flat out refuse to sell ANY of the three mentioned above. Ive had more come back than not. NGK V-power plugs have my vote. Ive never had any trouble with them. From derby cars, circle track cars, daily drivers, pickup trucks, hot rods, sand dragsters, to street cars, ive never had a single one come back because of a product failure.