Sounds like I'm not the only one. I got roasted in the post I made but this is exactly the same crap I hear in my car between 2-3k RPM's. I made a video but the sound quality really come through unless you turn the bass up a bit. Brought my car in last week for the 1200 mile service and drove around with a tech. It took a while for him to understand what I was talking about and what worked was sitting at a stop, in neutral, then slowly reving the engine up past 2k.
At 2000 RPM's there's a higher pitched drone. Around 2200-2500 it's...wah wah wah wah, then gradually speeds up closer to 3k. Past 3k I can't hear it because the engine noise is so loud.
It's incredibly annoying and I find myself constantly keeping the car out of the 2xxx RPM range because of it.
Link to my original post.
http://f80.bimmerpost.com/forums/sho....php?t=1077957