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I used to have the same one on my 2006 WRX and it drove me mad.
 

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Discussion Starter #6
I have had many turbo cars, never had one with the dump valve sounding like a chicken though!

:clap:
 

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The chatter is air blowing backwards through the turbo because the dump valve is too small.

Mine makes a similar noise at high pressure, but as the pressure drops it changes to the normal hiss. I can cure this with a larger valve, but I dont mind the chatter and it doesn't really get time to do it on gear change.
 
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