Very easy to install, remove old ones, change or replace heat shields (if needed). Most importantly, at least on my car, 2 "clicks" were felt when attaching to the coils. I figured I'd ride until I noticed a "clean" area where the old boots were covering the ignition coils, I gave them a bit more and of course right where they belong. Also, after securing them to the spark plugs, gently pull on the heat shield to lock the springs in place. The car started, all 8 cylinders ran smoothly.
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