Stop in for a cup of coffee
When I say the graphite prevents rust, I'll mention that I'm running a set of mid-length "home made" headers, as in chopped up and rerouted the pieces of a barely used set of cheap long tube headers. ....Don't try this at home! (It took me as long as it did to build the 340 the first time.) But I made them up in '93, so probably close to 80-100K miles. Finally had to redo the collectors.