Check Engine Light with ZZP downpipe (catted)

Yea if you soaked it down with penetrating oil it should burn off pretty quick. I had a strange smell when mine was new but it's a catless one. I think they spray some kind of a coating on the stainless. It should burn off after a couple good heat cycles.

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I cleaned the gasket and the bolts. Not the like front mating part
And on the coating that make sense

New converters also have material that hasn't been heated yet and a couple heat cycles it will smell like burning plastic/paint.

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Originally Posted by REDCOMPG

Well I'm willing to bet you didn't clean any grime that could be on it so yea it's somewhat normal. Give it a few days and it should all burn off.

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the new intermediate pipe i put on stunk pretty bad till i took it on a 100 mile road trip, then the smell was gone.