Happens when accelerating/decelerating - always right at 2000-2200 RPM. Most noticeable from a stoplight, accelerating in traffic, but have heard it at high speeds as well. They thought it was a problem with fuel pump & even replaced the entire fuel tank under warranty to address issue, but it is still there?
Rattling noise at around 2200 RPM? on 2004 BMW 325Ci
by CRIDas in Santa Ana, CA on April 25, 2012