I have to say these pipes' made a "world" of difference in sound. People just cant believe the low rumble the pipes produce. They really turn heads when I drive by now. They just cant believe the quality and sound for a Metric Bike. Defiantly a good investment. Yes, performance wise I do recommend the jet kit for the carb's to get the full potential of the complete upgrade in power but, for now the exhaust is enough for me. I am very pleased and impressed with this purchase. Just have to save up some more money to continue to upgrade my bike.