I would double check your tire pressure. You may have too much air or not enough. I found that my car felt like it was going to slide out on me when pushing a little through the turns. It turned out, the dealer put 60 psi in the tires. I never thought to check that on a brand new car, but sure enough, I had to let out almost half of the air. Now the car rides and drives like a dream. I called the dealer and they had no explaination. (not suprised) Also, that crackling is the exaust cooling down. totally normal.
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