Thanks for the advice guys. Here is the update so far.

A PUMA case was opened, then it was pushed up to national level (so they say). Some additional diagnostic device was hooked up to the truck to try and capture data when the it actually stalls.This happened, they forwarded the info to BMW NA and were instructed to replace the high pressure fuel pump....I was a little miffed by this since the symptoms don't really fit a HPFP failure as I am a former e90 N54 owner and have had a few friends need theirs replaced.

THe HPFP was replaced and guess what? It still stalls...
BMW NA has now authorized replacement of the DME computer. This was special ordered and will be at the dealer either late Friday afternoon or Monday.

So far they have had the car 2 weeks as of tomorrow, they have reporduced the problem multiple times with and without diagnostic equipment attached and replaced one item...

They have been pretty communicative so far, but just frustrated at how long it has taken.

Thanks,
X

PS A, have hung out on the M5board, but not a contributor. Dream about an M5 one day...

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PCD 12/3/10: 2011 X5 50i/Alpine White/Cinnamon/Bamboo: M Sport, Tech 20" 333, Cold Weather, Premium, Prem Sound, Rear Climate, rear heated seats, HUD, CA,
Wifey's ride: 2011 X5 35i SA Vermillion Red/Tobacco/Walnut Tech 20" 214, Cold, Prem Sound, rear climate, CA