I too wanted to shed some weight from my AT and maybe gain a bit more power, so I acquired an Akropovic slip on muffler. Sure it sounded a bit better...BUT, it was too **** loud especially at highway speeds. I'd get a headache. This was just before I went on an around the USA 6,500 mile ride, thank goodness I went on the trip with a stock setup. So I sold it to a local guy who loves it. I'm staying stock and I like it that I have a catalytic converter, as I'm not stinking up the environment. That is my experience.