For thoese of you who are running the E3"s. You should check them after a few thousand miles. My son had them in his RAM 1500 4.7 and it started to run like crap. We took the plugs out and 4 out of 8 were shot the center of them were gone and all that was left were 3 prongs wish i had them to post a pic. He was lucky he didn't screw up a valve or piston. In my opinion i think they are junk