I have a Yoshimura RS-3 stainless, originally from a GSX-F 750. This is mostly for the looks, the sound is not deep or loud but sounds nice. Next to that one I have a Micron, I believe it is for a ZXR 400 which makes is ideal for my Bandit 400. Deep and loud sound and less reversed pressure than the Yoshimura. It runs leaner with the Micron can. I'm still looking for another Yoshimura for a bike with an engine like mine.