What makes a car sound like there is turbo in it?

A turbo

When one of your car's add-on's, eg. alternator, Power Steering pump extr, start to developt a bearing defect. The car will sound as if you have a turbo in.

to determine witch part is starting to fail, open the hood and listen.

Use a long screwdriver, put the handle against your ear and press the metal point on the housings of the different parts when the car is idling. Just like a docter use a stetoscope.