did a search didn't see to much on those E3 plugs, I had tried them just for kicks (5.00 a pop), well they are horriblly manufactued , no quality control, gap is different on each one, ecletrode's are slanted, some beveled, some cross cut, and this was all in a selaed pack of four, Horrible! Can't comment on performance, but I would assume that these difference between each plug would greatly affect performace.