As far as I know my 82 muffler is original, but it gives out a light Thumping noise when U just start increasing speed, say in the 5-25 MPH range. U can hear it from behind the driver. Once up to speed it is quiet.

I removed the pair in middle and straight piped that part.

Only one left is at rear. Thanks!

Strange German Steel to last this long. No holes anywhere just internal Thumping.

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1982 300SD