the 300D front end is built like a tank. I cant think of anything analytical thats causing your problem and I know front end problems very very well. Anyway turn your front tires fully out on driver side and passengers side. If you are ambitious, jack the car up. Inspect the ball joint covers and the tie rod covers and all the other rubber joints. Something is definitely loose here and thats all it is. Have someone turn the wheel right to left and i guarentee the problem will be apparent quickly!!!