I have been using the COPPER as others have said the COPPER RTV for years. Both mating surfaces must be clean, real clean. Place a good sized bead on the TP flange, then tighten it up, but not torqued down. I let it sit for an hour, then torque it down, done. NO leaks long after gaskets start leaking. 8 bucks at advance for a tube enough to do a whole exhaust.
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