Pretty much ever since I got my new car, there has been this rattling sound coming from outside, especially when the engine is cold. My brother in law heard it today and told me its and exhaust leak. Has anybody else ran into this? I'm going to take it back to the dealer for warranty work and I have already recorded it when they decide to tell me "couldn't duplicate problem." Also, my auto lift-gate went today (will come down but not seal shut)...kind of frustrating that I've had more problems with my 2012 than I had the whole time I owned my 2009.