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O2 sensor on coated header

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I'm looking into gettin a ceramic coated header and the performance exhaust system for my 77 280z, I'm using ms2 and have an o2 sensor welded into my exhaust pipe. The headers dont come with an o2 bung. Should I buy the coated header and weld a bung into the collector pipe? It seems like a bad idea and might ruin the ceramic coating, or should I buy an uncoated on and and coat it myself after I weld the bung in?



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