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Gasket sealer on turbo to cat connection?

1046 Views 6 Replies 5 Participants Last post by  northcountryguy1
My "OEM Grade" MagnaFlow cat broke at one of the welds (cat/pipe joint nearest turbo) after 5 years so I'm replacing it. (BTW, my original cat lasted ~11 years so you be the judge.) Just got the old unit out. Last shop apparently used some copper based gasket sealer on the turbo to cat flange joint. Do I need to use this on the new gasket?

Also, the flange on the downpipe appears to have some remnants of the prior gasket literally welded to the face, see the image below. (Turbo flange is perfectly clean/smooth.) I tried to scrape it off but no success. Is this going to be a problem for making a good seal? Or use the sealent here, too?

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I understand that RTV sealer can damage the O2 sensors, and manufacturers recommend not using it to install their sensors.
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