There is an update for the 06 m7 that came out this past summer. Take your ecu to the dealer with your name and serial number on it and it should get sent back to Arctic Cat for the latest program. Should all be free, mine was!!! It leans out the bottom end a little, and should be a little smoother. I run a boondocker box and thought I wouldn't need it, but it helps for smoother compensation when changing altitude or weather. And it's freeeee!!!!! On the M7 that were really bogging lots it helped out some, if your sled wasn't bogging too bad, you probably won''''t notice too much. But did I say it was free?!? It's free.