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2002 996 Turbo Engine Sound

Engine

Vehicle Information: Model: 996 Turbo; Year: 2002; Body Type: Coupe; Total Mileage: 34000;

Around 3000 rpm and when accelerating gently, the car seems to have a rather intermittent honking / moaning sound. It vanishes if I change engine speed (accelerate or change gears). It seems to happen regardless if the engine is either cold or hot. This is my first Porsche and I've only had it for 5000 miles. Both diverter valves were replaced less than 1000 miles ago. I've owned the car since Sept 2007 when it had 29000 miles and I don't recall this noise before this spring. Does this seem normal (a known turbo noise) or should I bring it to be looked at?

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