I'd seen you shouldn't use silicon based sealant prior to the cat since it can foul it permanently so I was surprised to see it used there. I'd prefer to just use the gasket and didn't think a sealer should be necessary. I'll clean up the flange on the downpipe. This will be the last cat I put in this thing so just has to last a year or two at this point.
Gasket sealer on turbo to cat connection?
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?
![Auto part Automotive exhaust]()
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?
