Looks narrower than my old muffler (95 ls) which was also full of hair and no metal.
Call them and see if this is a 60546805 Cisam OEM 164S muffler. Prolly not but I doubt you can find an OEM one now. But that being said you can try Difatta Bros in Baltimore as they are selling off their business AND THEY HAD A WHOLE ROOM FULL OF JUST EXHAUST SYSTEMS.Do you happen to have a part number for this?
This is why it's so confusing. The nitrating process must have failed or something because 1-2 hours of use (mainly idle) caused 0.04mm of wear on some main journals… Oil pressure was lowish 0.3-0.4bar (idle, hot; probably due to failed grinding) but that really doesn't explain the wear.Properly nitrided cranks should not wear worth talking about for many thousands of miles.