http://www.e90post.com/forums/showthread.php?t=1334283
You can try this egr bypass if you are a little diy savvy. It's very easy and only need a paper clip, and about 5 minutes. A little better mpg. You will get a cel on dash unless you get it coded out. Helps with CBU as well. The good thing about it is you can just re-insert the wire at anytime and it's back to stock. Very useful page on the m57 diesel. Same engine different model car.
EDIT: correct url.
http://www.e90post.com/forums/showthread.php?t=1401027