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I have the exact issue on 328i with Injen intake. And on another 328i completley stock. Bothe have the same noise.
At first was the stock 328i wich developed the problem. That car has 70.000km.
The Injen 328i has 48.000km and just developed the noise.
At the dealer, they said they could not figure it out. So when i picked up the car i went outside with the service guy and made him listen carefully. He told me that it seems to be alternator bearings going bad, but cannot be 100% sure. And he would not make a firm statement as the alternator is an expensive part, and he would not replace it just to confirm a diagnostic.
The injen car is off the warranty. the other one still is. So i will wait to change it on this car before paying for a new alternator.
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