I'm on my second set of stock shorties. The first set I removed the cat and set valve and removed the entire front set of baffles from the mufflers. I rode it like that last summer and really did not care for the tone plus it was louder then I wanted it. The set that is on there now I like much better, same mufflers but new head pipes with cat and set intact but not functional. I like these much better. The first ones had kind of a "tin" sound to them if that makes since. The ones on there now have a deeper tone to them.:bigthumbsup: