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The durometer of urethane is highly effected by temperature. A spike in durometer of 20% would certainly cause an increase in NVH. There is also a chance of tearing the urethane since the toughness drops along with temperature.
In reality, the entire car gets stiffer when the temperatures drop. Your engine mounts probably get stiffer too. Most of the plastics and adhesives in the car probably have a significant rise in stiffness amplifying existing NVH the car had even when it's warm.
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