So occasionally when I am stopped at a light with the radio off, I can hear this somewhat rythmic rattle/banging. It is very soft and seems to be coming from the under carriage towards the back of the car. My thoughts are that it is my muffler or something that is just poorly mounted (I am running the stock muffler). Has anyone noticed this? If so, have you had it checked? What is it? etc. etc.
