[smnbyt]

Which is best for the exhaust system and the exhaust manifold, Stainless steel or the copper/brass ones??

 

[Thor1950]

copper/brass will break down and not handle the heat and there will be a electrolysis issue. Steel or stainless nuts with a dab of high temp copper coat/anti seize compound

 

[smnbyt]

copper/brass will break down and not handle the heat and there will be a electrolysis issue. Steel or stainless nuts with a dab of high temp copper coat/anti seize compound

Good good, that's what I have done