I just spoke with some dude at the cobb website, this is the transcript:
Why doesn't the accessPort work with Z4 2009?
The 2009 Z4 does not have the twin turbo engine in it is the reason the AccessPORT will not work.
Of course it does. I have an Sdrive35i
You are correct, the AccessPORT will work on any Z4 with the N54 twin turbo engine
would you mind letting people know so they can correct it in the website?. i don't feel confortable purchasing it when it says to check compatible models and mine isn't liste
I will pass this along.