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      05-04-2021, 10:51 PM   #7
johnung
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Drives: 2015 BMW 335i x-Drive Auto
Join Date: Oct 2017
Location: New Jersey/Philadelphia

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Quote:
Originally Posted by 435gc View Post
BMS intake with stock DV produces a pretty audible turbo swoosh.

To the Jeremyman9's point, when I installed the TurboSmart Plumback DV, the swoosh was nearly silenced even with the BMS intake.
The Turbosmart Plumb Back model is designed to be the quiet model. The only perceptible sound is if the car is in Sport mode and you momentarily let off the throttle. The driver will faintly hear the second syllable of a whippoorwill bird call coming out of the intake on the left side of the hood. Google the whippoorwill bird call. It sounds exactly like the second syllable.

The Turbosmart Dual Port model is the one with the whoosh sound. The dual port is partially vented to the atmosphere so that sound is coming from where the N55 Diverter Valve is mounted, next to the turbo on the right side of the hood.

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