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Hissing noise when pressing accelerator?

Agray

Go Kart Champion
Location
Washington
OK, and so if it's the diverter valve, that means it's totally normal? Everyone hears this hissing noise?
Since you still have not posted a video demonstrating the noise, we can only assume that it’s the DV, which makes sense based off your description.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
If you are worried about it go to the dealer. You are under warranty.
 

Keehs360

Autocross Champion
Location
Denver
Car(s)
Mk7.5
As soon as you let off the gas the built up pressure recirculates through the diverter valve. Totally normal but taking it into the dealer isn’t a dumb idea. Just in case
 

tarheelbob

Ready to race!
Location
Asheville, NC
Car(s)
2021 VW GTI S
Yes, it's normal.

On my 2021 GTI, I tend to notice it more when I have the windows down, for some reason. But, yes, I hear the same thing under similar conditions as you mentioned.
 
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