All steel ex pipes corrode unless they are coated with either a ceramic or
ali plasma coating (and even then sometimes...) so unless you are ready to
replace them frequently they really should be some sort of stainless -and
they just corrode more slowly... the better the stainless, the slower they
corrode. You get what you pay for.
>
>When mounting the tubes together I am wondering if I shall put some high
>heat resistance Molybdenum grease or similar so the next time I can
>disassemble the tubes from the main silencer box. Any suggestions?
About the only thing is a a copper loaded grease (Copaslip), although
silicon RTV works excellently as a pipe to head gasket goo.
Miles
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