This is the first time I've posted a reply even though I've been lurking (and gaining a lot of good information) for quite a while. I do not want to pretend to know everything, but I have owned a lot of motorcycles and ridden a lot of years so maybe I can offer some help. I bought the replacement mufflers for my 2014 SF and of course had some issues with clearance, not only with the drive chain, but with getting the pipes to look evenly spaced from the frame, pegs or whatever. This wasn't any new problem that I had not experienced with similar products on other motorcycles over the years. What I did to make things right was quite simple. Before I just bolted the mufflers on and tried it out, I loosened every clamp and mounting point on the exhaust just enough to adjust the alignment of all exhaust components. I then shimmed each component to be properly aligned and have adequate clearance making sure both sides (left and right) were the same. After everything was in position, I went back and tightened all the loose clamps and mounting points. Then I removed the shims. Finally I got to give the bike a minor thrashing to try it out. This might be too simple a fix but it worked on mine. Charlie ( and no, I'm not going to tell you what other bikes I have, where I live and what days I'll be gone on vacation)