XBimmers | BMW X1 Forum - View Single Post - Does anyone hear a whistle sound when letting off the gas? xDrive 35i

Transfer · 08-30-2012, 08:09 PM

When you let off the gas, the bypass valve closes and boost is evacuated out the intake. The N55 has some fairly nice turbo noises, although I'm sure some people don't like it.

08-30-2012, 08:09 PM	#2
Transfer Major General 5250 Rep 5,874 Posts Drives: Bronco Wildtrak, Tesla MYP Join Date: Mar 2010 Location: Issaquah, WA iTrader: (1)	When you let off the gas, the bypass valve closes and boost is evacuated out the intake. The N55 has some fairly nice turbo noises, although I'm sure some people don't like it.
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