I just installed one of these filters on my bike. I have a 2009 EFI with a Mivv GP slip-on, which I have been using for a half year now without doing anything with the A/F ratio. It was running abit lean, but nothing that desperately needed to get changed. After I also installed the K&N filter though, it definitely needed a remap. So I don't know how much difference it actually makes, will be exciting to see after the remap. But the quality of the filter itself seems WAY better than the stock one, and the fact that it will last the bike's lifetime makes it worth it anyway imo.
Now my bike is in winter storage at the dealership, and they would take care of the 6.000km service, remap, change to iridium plugs, and new coolant. I'd rather have the race mechanic at the dealership do his magic with the original ECU at the cost of some work hours, than getting the expensive PowerCommander. Can't wait to pick the bike up after the winter
