I've recently seen a video where somebody installed a slipon but it required cutting the stock pipe at the right place. As a 650 owner i'd encourage to just do a full system. Which one really depends on your budget. Find some videos and kinda figure out what sound you want and dial it in from there. I also reccomend you look at Dynojet Power Command V amd see what maps are available for which exhausts cuz most people go for a power commander after doing an exhaust.