I have the se slip ons and had to reflash mine after I relocated the IAT sensor. As far as feeling a difference you really won't. The advantage of having the IAT in the air box instead of the intake runner is the fact that it can detect air temperature much better and is not as bad about hot soaking when you shut down for a few minutes. So it short it improves general drivability but not in a manner that you can really put your finger on.
Max