Just added a 78 gs400 to the stable. Anyone have experience in performance parts for them? Mostly looking for an exhaust upgrade. The previous owner ditched the stock exhaust and added a straight pipe onto the stock header pipe that is loud ugly and kinda makes it sound like a two stroke that is running wayyyy too rich. I'm in the middle of a cafe racer build with it and would like to find some pipes that will give it a little more punch. Perhaps Yoshimura made something that fits?