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In the middle of restoring my Vette and have no idea where this connects to. Just replaced the radiator brace and have no idea where this end of the hose goes.
In the trash or atleast it did on my Vette lol. That connects to your factory airbox or aftermarket intake if it comes equipped with a port for it, and it's for the Air Pump that pumps hot air to the cats on startup so that they'll reach functional temperature quicker.