I had the same question when I first got my FZ6. One suggestion I would make is ride it a while before modifying the exhaust. Get use to running the higher rpms to maximize the available torque that kicks in around 8k rpm. After you are proficient at the higher rpm's see if you still want to modify the exhaust. Personally, I found the exhaust note fine after working for the higher torque in the 8-12K range. Good luck and enjoy.