Don 
2005 BMW Z4 Convertible 3.0i 2dr Roadster (3.0L 6cyl 6M)
excessive noise
 I actually bought this as "Mother's Day Gift" for my wife last year.  She actually gets to drive it once in a while.   The only complaint I have is the excessive noise that comes from from the passenger seat when my wife is riding with me.  "Are you crazy?"  "Slow down!" "I am NEVER riding with you again in this car!!" often can be heard even over the sound of the engine as I shift through the five gears.  My only regret now is that I did not buy the 3.0 for a little boost.