Alfa Mito 155 hp surrending sound, which is the

Hello people, have bought me a Mito Tjet 155 PS Bj 2009 from a car dealership everything really tip-top, even new tires with it, 8 times tyres also got new TÜV. Vehicle is first hand with original 60,000 km. I also got a used car GARANTIE extra to it. My wife already drives a Mito with 95 HP. Where I looked at the car, I didn’t think anything about it, since I never had a car with turbocharger, I could not know if this is normal, since is t a whirring noise in the engine compartment, could that be the turbocharger? Have only had a vehicle with turbocharger before, so I could not get a picture on site whether this is normal or not? Engine sounds great, clutch also, it goes well, would say full power he definitely has, only this buzzing makes me worry about something, can it be the turbo? Timing belts were made in 2015, oil change in June. Auto dealership means it’s all ok, since I don’t have such a sound nne I want to be sure, seller said if what should be I should report. I remember the sound of a defective light engine, or like a remote controlled toy car. I could record it so that you have an idea. Can you have a turbocharger tested in the built-in state? What do you think about what noise it is. Thank you