I have the same problem as Forde, I just fitted a MM 2 into 1 exhaust and when I close the thorttle the exhaust bangs loudly, I try to change the CO in 13, 20, 25, 30, and even 50 but it bangs out anyway.

I have the AIS removed. What should I try now??

Kev, you talked about idle speed, (I�m spanish) maybe is what we call "ralent�"? (when the bike is started but the throttle closed).

Thank you!!