you can search on the ninja650r forums for lots of exhaust info. there are specific frame sliders for the V, but they're kinda pricey. If you're good with a tape measure, you can probably adapt some R6 or other sportbike sliders to the front engine mounts if willing to get rid of the plastic radiator cover. The crash bars are pretty ugly, but probably the best protection. on the ninja forum, they say the akrapovic is the quietest and the muzzy and that other pipe (BOS?)with the slash megaphone tip is the loudest, if I remember correctly.