Appears several 05ís were shipped without some (2) bolts securing the shield/cover over the tranny bell housing. This thin piece of metal can make a very loud tinny rattle when the car is started cold. As the car warms the rattle ceases.
Below are pictures of the culprit. (Passenger side)
And the other. (Drivers side)
Clutch cover plate for Tremec manual transmissions.