I had a similar noise/rattle on mine. The dealer said there was nothing loose under the car, and did not fix anything.
I was under the car yesterday and found the above mentioned heat shields and I had to bend the one over the muffler to keep the exhaust pipe from hitting it. It is bad enough that the car is equal in strength to a beer can, but couldn't they spare some heavy gauge metal for these shields? While we are on the subject of rattles, is there any way to tighten the spare tire cover? The center section doesn't seem like it will stay on and the outside edge is loose where it is supposed to contact the tire.
