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There's a few things to consider before buying these plugs. They won't break off in the heads, they're a one piece plug. I don't think they weren't really intended for a stock motor, I've heard people have had trouble with them being used in a stock motor. I have a lot of upgrades on my engine, so they work great for me. Before I had my truck custom tuned for all the upgrades, long tube headers, 3 inch off-road Y pipe with no cats, and full 3 inch exhaust from the collector's back, and cold air intake, I was fouling plugs, even melting plugs, because the ECU was trying to compensate for much larger volume of air than a stock engine flowing through the intake into the combustion chamber and out the exhaust with no restrictions, no back pressure, the air fuel mixture was way off. This cause all kinds of problem, the truck run terrible, backfired, and bogged like crazy, but it really had nothing to do with the plugs. Since I got my tune, the engine has run so good. They seem to be great for my application, I probably gained 1 or 2 mpgs with them. They are great plugs.Read full review
Verified purchase: Yes | Condition: New
Great Price, truthfully you can not beat this price at Auto Zone nor Advanced Auto. It took a about 100 miles for the computer system in the vehicle to adjust to the plugs range but after that it seems to run better have more power and save a little gas. At this price you still can't go wrong.
Verified purchase: Yes | Condition: New
I am sorry I bought these plugs with out reviewing them first I found out they run terrible in the ford 5.4 v8 now I have them what do I do with them. everybody I talk to about using them in a ford they say do not use them they run good for a period them they start to misfire I do not know if you will take them back
Verified purchase: Yes | Condition: New
Second set of these plugs. First set I used for almost 100k miles with no issues. E3 guarantees them 100K or 5 years and I'm almost at 5yrs too.
Verified purchase: Yes | Condition: New
I like the e3 plugs, they deliver as stated, I just wish the quality was a little better. Electrodes are comonly not centered. But I got a great deal.
Verified purchase: Yes | Condition: New
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