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Had this same issue with my 2nd cat delete catback. Tried resealing it a few times, but it kept coming back. After some research it appears that others with this issue actually had a bad cat. Took it to the dealer and they replaced my drivers side cat under warranty and problem was resolved.
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2017 1SS 1LE - Eibach Springs | Pray IM | Katech TB | Borla 60606 | Corsa Extreme | E85 Flex Tune
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