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Is the sound coming from behind the passenger seat? Could be Hpfp in that case. From the engine bay? Look at the turbos. But really, you can't diagnose a sound on the interwebs.
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.
2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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