Hi!
Here (in estonia) we have a bike tuning shop www.dragbike.ee who specialises in rebuilding bikes to extreme.
So what they say, when it comes to modding, is usually true.

They are offering something called AFR tuner, which is 3 times more expensive than PowerCommander, but they claim this it is much better because when it is installed and tuned for your bike, it will keep itself automatically tuned nomatter what you do with your bike later. For example, you are changing your air filter, you are fitting the stage II filter, removing the snorkel, fitting another exhaust etc etc. - and the AFR keeps adjusting itself back to "normal" mode so the AFR ratio is always correct.

They (dragbike dudes) say that for example, on a longer trip, when roads are dusty and air filter doesnt let much air in anymore, AFR automatically adjusts to it, so the mixture wont be too lean (correct me if im wrong here, if not enough air is let in, then it will be too much fuel, correct?).

Here is my question - has anyone ever tested something like this? I have a 07 model XT660R and my first thought was - powercommander cannot be fully tuned because of my 07 ecu, what about this AFR Tuner thingy?
I bet Kev has some kind of answer to this, but if anyone else has something to share, pelase do so.