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Are you putting the A/C in recirculate "M" mode? If so, I would check to make sure the outside air is not entering the HVAC. Use some smoke or steam vapor where the fresh outside air enters the HVAC system in the engine bay see if it comes out of the vents. If it does the system is not closing the door the blocks outside air from entering the system.
You should not need to wrap the down pipe. At speed heat should not be building up in the engine bay since enough airflow should be expelling it.
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