Ok, on the heat shield to each manifold, its has this white, padding like material attached to it, I guess like a heat resistant type padding.... anyways, it looks like whoever installed the manifold sensors got some of that padding caught up in the threads... Thats the only guess I could make... I had headers installed recently so I have the heat shields off.. check out the pic
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09 Nismo #0483 sold. Viper or C7 next time around.
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