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Thats funny that you dont hear the Turbo whistle anymoe...
Considering how most turbo's work, it takes time to build up pressure, and the pressure shouldnt drop "that" fast when you shift.
My friend has an Audi and when he shifts the Turbo Gauge stays enagaged because it hasnt had time to depressure yet.
I used to have a Saab Turbo 900 myself but I do not remember if the whistle disappeared on shifts...

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