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my truck ing. system is too strong for iridums, i have tried 2 sets and get abou 20-30k out of them till the tip is gone. then the truck starts missing. u dont know how funy it was pulling into autozone and buying cheapie plugs and changing them in 5 minutes in there lot in front of the door, so i could continue on my road trip/
but looks like a decent improvement for you.
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