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no suggestions to what it might be - although the bump in the road thing suggests suspension, or some component of it.
however if the sound is truly metalic - as in metal on metal - nothing beats getting down low with a flash light and having a really good look for any "fresh metal" - everything else should be quite darkened by road grime, so if you are truly hearing two metal things rubbing, the visual indication should be quite obvious as in shavings or shiny metal surfaces somewhere - while your down there have someone bounce the front end of the car, and see if you can see anything binding, or perhaps better pinpoint the sound. probably not the answer you're looking for and a pretty obvious one at that, but still take a look around. grab at everything see if you can make anything move by hand that shouldn't be able to move by hand pressure alone.
best of luck.
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