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Leak between my catalytic converters and headers

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I have a 5.3l V8 in my 2008 chevy Silverado 1500. I recently removed my catalytic converters and put them back on, however theres a lot of exhaust fumes coming out from both connections between the headers and the converters and it sounds like shit now, i have a flowmaster exhaust and its sound has completely changed (very sloppy). Could it be that when i broke the seal the gaskets were compromised? (new gasket = fix???)

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