My experience is that the coppers should last about 15K miles for me. The 7EIX only lasted 20K and were significantly more expensive and not nearly as responsive as the 7EX. I have a set of 7EX sitting in the box so when I pull my 8EIX this weekend I have a backup set if I need to replace them. I'm getting spark blowout at WOT starting around 3K RPM.
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