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The white smoke is water vapor that has collected in the walls of the exhaust pipes after parking overnight. In cold weather. The vapor is kind of  saturated so when it exits the tail pipes thus can be seen.  No harm.


The cracking sound , which are occasional 'tick' is the due to the contraction/expansion displacement of the heat shields/guards and the exhaust pipes. It is audiable after you shut off the engine. No harm.


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