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One step colder plug for a stock head would be Autolite 23. They can be found at walmart in a two pack for the price of what one would cost at an auto parts store.
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2012 Jeep Wrangler Unlimited--- too many mods to list, about to be sitting on 1 ton axles.
2000 Ford F-350 Dually Lariat LE Crew Cab Short Box
7.3 auto 168,000 miles
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