i had the same plugs you do in my topswap with only 2k miles on em. ended up having to swap to AL104s because it was causing some KR
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AC DelcoFactory Replacements: Stock
Autolite 606: Stock
Autolite 605: 1 Heat Range Cooler
NGK TR55: 1 Heat Range Cooler
Autolite 104: 2 Heat Ranges Cooler
NGK TR6: 2 Heat Ranges Cooler
Autolite 103: 3 Heat Rangles Cooler
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