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I put mine in after sending two and then receiving one modified valve back from zeckhausen. I got my CDV's in Germany, but they can't be much more here in the states ... around 3 Euro each. So, for a total of around 10 bucks including shipping, it is the only way to go.
Shifting is much better and unless the dealer cuts apart the valve, no way they can tell. Regarding not using a valve, my e90 looked like it had enough slack to do it but did not want to risk the whole dealer issue.
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