Skeptical about them from reviews and videos on YouTube. These clowns just didn't fit right or got the wrong size. I had to double check the first size I made when I found a smaller tool to ENSURE they were correct as the original tool was long and difficult to reach. Just pull it all the way down, don't do it too tight. I can say that the car is picking up speed faster, I'm not crazy about it, but YES, it was important. By the way, my 2017 R/T 392 charger had NGK R spark plugs.
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