When he got his 1978 XL125, see my thread "1978 XL125 Problems", my cousin Dalton also got this muffler from the same person. I took one look at it and knew it was a 2-stroke and not 4-stroke. If anyone here can help me identify it so we can find the right person and bike for it that would be cool. It looks like the mid-pipe was chopped since it is too short, but that can be fixed.
Here be the pics
Here be the pics