I am not the original poster but the first reply to that OP. Yeah my car makes this sound for around 30 seconds then quiets. The car has 887 miles on it currently. My thoughts were the same on exhaust heating and expanding. I will most likely have the dealership look at it. I have had other new cars and they did not do that. My wife has a new Maxima with Sport pkg and it doesn't do the 30 rattle sound etc. It starts and the exhaust is quiet. period...
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