i just called my dealer and I was told the complete opposite, I have done 12000 km and I am almost due for a service but I did not want to go for fear of the power loss
I asked the service manager abouT this problem ( he is a friend of mine ) he told me the upgrade that he has ( 2007 ) will improve my power
I have made a arrangement to go next week and get the " upgrade " done, i was told that it helps with the high altitude ( 1600 m ) up here in South Africa ( JHB ) , SO ALREADY I am able to give a M3 a thrashing so I dont even wanna know what will happen after the upgrade ,,, hehe
Will let you know what happens after the upgrade