yeah well all that I can say is that it doesn't sound normal at all to me! I have never heard this noise before and all of a sudden it comes out of nowhere.
I took it to the mechanic today and he said that everything looks normal, and I even took him for a drive to make it do it and voila it doesn't make the noise...crap.
Anyhoo, hopefully when I get my car lowered next week I will find out the problem.