Also could you please remember to add the vehicle details and a informative title in the Thread Title next time as per forum rules please http://www.bimmerforums.co.uk/forum/...ement.php?f=69, the Thread title has been done for you this time. It makes it far easier for people looking up help for their own problems or conversions if they have the same car.
Loads of people on here have done it - myself included. It enables you to shift from 1st to 2nd in a hurry & not look like you should still have L-plates on!
The only reason a modified valve was ever developed was for cars still under guarantee - it looks like a CDV, but doesn't act like one. There's allegedly a few cases in the US where BMW refused to honour clutch defects under guarantee once the lack of CDV was noted.
So no replacement required, just remove it, join the pipes up, bleed, done! There are at least 2 "How-to's" on here - one of them mine!
As an aside, I bled my clutch the last time I did my brakes... huge difference in itself to the clutch action.