Well i just removed mine. My car is a 02/00 build date and it had a CDV. i would advice everyone to take a peek under the car just to be sure.
You beat me by 4 minutes on posting his site...very informative! E39's have them. M5 does not...according to the site. RealOEM.com does show one in the diagram, but does not list one for the M5...meaning it isn't included for that model.
With all due respect, I called him once to get a CDV bypass for my E46 and he said that they don't have them. Well, they do, and it did. Even experts make mistakes sometimes.
according to realoem m5 never had oneso whats the final verdict? only early models had them? m5 didnt have them at all? hit or miss like the mysterious oil burning / carbon effect?