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I've seen E3 plugs tested on the weekend Hot Rod TV shows in older style engines with positive results. But have also heard, they tend to interfere with computers on some modern cars. Think I'd stay away from them.
The stock iridium AC's are great plugs. Just use those or something coparable like NGK or Denso iridiums.
If you use anything other than iridium plugs, you may have charging issues, I and many others did. Do a search, there is plenty of info on the Forum about the use of non-iridium plugs.
I've always wondered about the "hotter spark/larger spark" plugs. Does it really matter?
I mean if you have a gallon of gas and hold a match to the open lid, it goes boom. If you have another gallon of gas and hold a blow torch to it, isn't it the same boom?
Not joking, here. Just don't understand the theory.