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2 into 1 on my 79 Darmah. Bike has 40mm Del Orttos with the enlarged intakes. I cant find any markings on the pipe.It seems to have a removable baffle insert that is easily taken out via two bolts on the back side.

http://picasaweb.google.com/mizike77/Da ... 9124241890

Hi Mizike,
Could be a BUB exhaust. Bub was started in 1978 and catered to twins at the time. Many of their exhausts were one unit like your's meaning there was not a separate muffler.
Dean
PS, see if you can get Steve to move this to the Restoration or FAQ section for better response.