Sounds like a big boost leak somewhere... that's as good a good place to start as anywhere. Easier that the next item - the injectors!

Check the intercooler for damage, and all the joints for leaks etc. There's a bunch of seals on the boost system, so disturbing any joint can require seal replacement....

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)