Quote:
Originally Posted by Yal
I get this around 2200 RPMs. I was assuming it was the fuel pump since it's the same RPM in every gear. Mine definitely comes from the back end of the car.
I used to hear what I assumed was an intake whistle, but it went away when I removed all the airbox parts and reassembled them.
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Mine does sound like its an intake sound. I have an afe airbox. I'm going to change it back to stock and see if thats it. Now that I thing about it, the Z4 3.0i has that intake sound into the cabin device right? Could that have something to do with it? I have never heard of this happening in other model BMW only on the Z4.
Update coming on stock vs AFE airbox