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fwiw, I have a 2012 hemi w 255k klms on it. I'm running iridiums with the stock coils as of 5k klms ago. I haven't had any problems yet. Although, maybe its too soon to tell. Running a canned diablosport 91 tune as well.
And I did my first plug change at 60k klms, second at 160k klms, and third at 250k klms.
 
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