I was trying to put a Blow off valve instead of diverter valve on my X6M, after I disconnect the Diverter valve hose(which blow the air back to the intake), I found that the diverter valve became a blow off valve. It sounds cool but don't know if it is bad for my engine/turbo.
Here is my video link:
I've check a engine E70/E71 S63 engine manual to find out the Diverter valve, compare to the N63, the different is the N63 DV is build on the turbo, but S63 is build on the turbo charge pipe which is like N54. It also control by the throttle body.
Here is the PDF link about the S63 engine manual:
http://xseries.su/manuals/bmw_x5/E70...s-x5-e70-6.pdf
and the N63 engine manual:
http://www.kneb.net/bmw/F01-02/02_N63%20Engine_WB.pdf
Save this two PDF it will give you more knowledge about your E70/E71 5.0i or M's engine.