Jan 10, 2010 9:51:39 AM
I thought that the M engine has different internals than the standard xDrive50i engine. Maybe I am wrong, but the M definitely have different manifold design and a very high boost. Anyway, here is a good read about the M engine.
http://www.ausmotive.com/2009/04/05/bmw-x5m-x6m-and-a-heart-of-gold.html
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