OK, I see what you are talking about. You only have to loosen the front bolt to get the muffler off. After the bolt is loose, get a chunk of hardwood to use for a drift and a single jack hammer and knock the muffler back off the header. It will be stuck on there pretty good if it has been there since 1976 when Soichiro installed it. (It is a well known fact that Soichiro Honda was so enamored of these first 750F's that he insisted on doing much of the assembly on these models himself.) But it will come off. I just took the one off in the pictures as a demo. It has been on there for decades and only took a couple of minutes.