[Dirty Harry]

I don't have a BDR, but I had an annoying rattle whenever I hit a bump. I couldn't seem to locate it. One day I simulated a bumpy road by hitting the tires with a rubber hammer. Sure enough, when I hit the RF tire, I heard the noise, this time right in front of my face. One of the vanes in the side louver had gotten loose. Easy fix, problem solved.