If it's a repeated sound when you turn - "click-click-click-click-click" - then it's the CV shaft. If it's just one sound - POP - then it's probably the ball joints. Roll the windows down and turn off the radio when you're in a parking lot, and see if you can hear it more clearly. I hear people with bad CV shafts tooling around the parking lot of the hospital all the time. (I like to diagnose people's car problems as they drive by during my lunch break walks.
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