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In the morning, when I'm warming up the engine, I can hear a slow, faint thumping coming from the rear of the car. A buddy at work tells me it's probably my exhaust system expanding from the heat. I've never noticed anything similar on any other vehicle, unless I just pay more attention to this car since it is my first new one. Anyway, I'd love to have some input on this, 'cause I'm afraid to open the trunk...
