I've noticed a noise in the front end of my car that sounds like metal scraping. It occurs when there is bounce in the car, like going over a speed bump or a dip in the road. Its very noticable on a particular section of highway where I live and not so noticable at other times. At first I thought it might be the CV boot, so I had that checked out and was told that's not the problem, but the mechanic isn't sure what is. He heard the noise, but can't pin point it. I then had new tires put on and the rotors turned to see if it made a difference. I'm still hearing the noise and the garage I took it to today is telling me they don't hear it.