If one were to only use stainless or ceramic packing I would think that it would last almost indefinitely. Worst case scenario is that it needs to be reopened and packed every few years. The cutting and rewelding on a regular basis would get old. A riveted closure would make it more reasonable. I have practice repacking my bike mufflers.
I'm not a fan of the sound of the Crios mod or bypass pipes and can't deal with an overly loud muffler or drone.
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