if its really annoying and you think its obviously an issue that you cant resolve... ask a mechanic to inspect the noise... should be free. but some might charge you. good luck
"There is science, logic, reason; there is thought verified by experience. And then there is California." -Edward Abbey
"Learning from experience is a faculty almost never practiced." -Barbara Tuchman
...the mod bug got me and my Alpine 330ci;there's a list somewhere...