When turning 90 degrees from a dead stop, there is a noise almost like you are driving over the "rumble" strips on the side of the road. It is not as loud or high pitched as that noise, but low and muffled. My car does it turning in either direction. If I take the same turn at any speed, no noise. Subaru dealer service department says it is just the AWD system and is normal. Is it? Called the salseman who drives a Subaru Impreza and he says his does the same.