I have an 05 zhp. Was wondering if any others have their zhp bog down at around 4k rpms when getting on it. Its been doing it since I purchased it. Its fine all the way through 3k but soon as it hits 4k and beyond it seems like its losing power.??????????????????????????????

It's a computer issue, I think there is a TSB on it, go back to the dealer and get your ECU reflashed.

http://forums.bimmerforums.com/forum/showthread.php?t=407195

Thanks....Im bringing it in next week. Ill mention that to them. Apparently this seems to be a common problem.