Agreed on the copper gaskets. The one I had between the UP and PS Ex. Man. lasted about a year before it blew out and looked like a volcano. Then the one I had between the Ex. Man and head started leaking shortly after. What a headache.
However, gaskets are exposed to the exhaust gasses while the copper washers will be on the outside of the pipe where, I imagine, it's much cooler.
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Slow and low, that is the tempo.
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