I just picked up a 2009 FZ6R (with 2,000 miles on it) for my wife to ride and it has a Two Brother exhaust system on it. It is loud but runs like a pig. From idle to about 4,000 rpm it stumbles all over the place. The bike does not have a Power Commander. I thought with a Fuel injected bike that they could compensate a bit for the pipe and you would only need a Power Commander if you wanted to really dial it in. DId I buy a bike with some other issue or does this thing need a Power Commander and fuel map.