No you don't, I am running my PCIII from my 04 XTX on my 09 XTX.

All the info is in the modification index.

12/ Which Power Commander fits which XT660?
http://www.xt660.com/showthread.php?p=144104#post144104

Cheers for clearing that up Kev, Dynojet need to make their information clearer but I guess with the missinformation they put out on their website they sell the newer PCV. Apologies to you CD01UK for the wrong initial answer.

no need Tony, just as you say, its not clear... thamks Kev for clearing that up too..

My findings are 100% correct & proven.

The reason I think (only a theory) why they list a PCV for 2009 on wards, it may have a different Zero map loaded compared to the 2004 to 2007 PCIII. The 2009 owards ECU part number ends with 11 where the 07/08 ECU ends with 10 & has different mapping.