Since fitting the full yoshi system I have been a little dismayed by the popping from the pipe when applying a little throttle after decellerating, although this I guess is to be accepted after fitting the pipe. I then fitted a BMC free flow filter which seemed to make things a little worse so I took her to one of the larger Suzuki dealers for a tune through their yoshi box & software. As most will know this isn't a substitute for a Power Commander but at less than 1/4 the price I thought I would give it a try. After 2 hours on the dyno & limited adjustments to the fuel flow the popping has all but gone ( still some from time to time) but quite happy with spending $137 untill I can afford a PC3. The local dyno shop wants $800 to supply, fit & tune the PC3, they are excellent tuners of race bikes but still maybe a waste on a 650 Burger when I am mainly just after a pleasing look as opposed to the truck size standard muffler & a weight saving of some 7kg.