Had them for over two weeks, just had the chance to install them yesterday morning. Some people really make this process of changing plugs seem much harder than it is. It is for the most part, just like changing plugs on any car, actually, I found it much easier.
Torqued each one to 22lbs/square inch. I took my time. It took 30 minutes to replace all 4.
Took the car out to test it out and there is a little difference in power which you can feel, very slight though, nothing like the boost in power that a chip brings to the table.
I've been using octane boosters on my car and it seems evident that MMT may not be that great for the car. All four of my spark plugs had orange coatings on them. After doing some research on the internet, I found that this was caused by the MMT that leaves a residue. So I will discontinue the use of octane boosters containing the MMT.
Overall, seeing as I got the spark plugs for Free-ninety-nine, it was ok, they would have otherwised cost $6.99 each, which is the same as the Platinum or Iridium NGK's. The E3 has a Copper core, but I think the electrode may be either iridium or platinum, since they have a 100,000 mile or 5 year change interval. I don't know if there is a mileage advantage, it is too soon to tell. I will update as that gets better.
They have a Video on Horsepower TV that shows these plugs produced 5.5 more bhp (at the Flywheel or crank) with less fuel consumption vs the stock NGK Super Platinum on a V8.
You can learn more about them here: CLICK, if you would like.
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