Doug if your talking about the Porsche in the picture then you don't hear anything because th waste gate is internal. it's inside the exhaust side of the turbo. to hear it you would have to put an after market one on the intake tube. then replace the intake box and stock air box with an after market intake tube. then you would hear it!
me personally i like the whine of the supercharger whine. once it gets moving with a lot of boost it screams!