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I have been reading some USA forums and there is a lot of people that have removed the CDV and say that the shifting is much better and dose not slip on full bore starts

Any body have any idea if this works and where can I get a modified CDV
 

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you can just remove the cdv valve and re connect the pipes.
thats what i did on my e36 and i am sure its the same as the e46,
someone who has done this on an e46 may be along soon to confirm.
 

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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.

HTH
 
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