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Might be a stupid question (?) but does anyone use RTV to seal the header pipe to the engine?
If anything is used, it should be a metal crush type gasket.
As for the silencer (muffler)/pipe connection, unless one bit or the other is damaged or there is some missmatch in size, any leakage should be self sealing as carbon deposits build up. Or, maybe I'm thinking of stem bolts. 
Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python
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