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Maybe this is just my 2 cents but I replaced my spark plugs at 30,000 miles thats under 50,000k. they had been in the car with a stage 1 tune for about 4,000 miles or 6,000k I would not have recommended running ANY longer on the plugs. The gap was huge compared to the new OEM plugs. These are stock copper plugs. Anyway just my 2 cents.
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