Bought twice (as 4 sets) as I was addicted to the fuel economy/performance gain of these replacements. But now I regret it. Engine performance was initially excellent but one cylinder failed within a few days, was replaced with super/extra care in spacing and installation, worked well this time. but after a few thousand miles another one broke down, bought a new 4 pack and very carefully reinstalled it. A few thousand miles later he failed again. As an engineer I suspect the ceramic is too thin/brittle and therefore cracking (shards on the motor!), the reason for the thin walls is probably (?) Mfg. You need a place to connect this "capacitor" / circuit to control the plasma generation. Good for temporary excitement, not long term/reliability, damaged my $1100 Cat converter with a misfire sending raw fuel when I was forced to drive on the freeway.
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