Here is what my mechanic said my issue was:

BMW calls it an “Adjuster” It is a vacuum operated adjustable flap that changes the tuned length of the intake manifold to enhance low RPM torque.

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2001 X5 3.0i (PP/WP/AP) Traded at 213K miles
RARE White on Black - Why does everyone get Tan??
First E53 with 215s on XOutpost!!