These pipes connect the fan housing to the heat exchangers. Not that heating is required with this week's weather.

And to answer yesterday's puzzle:

Purpod was right, they're carbs, Herbert Knufken was more accurate, they're twin carbs, and Bob Smith was so close, but just missed. They're actually Dellortos, not Webers, but they are off from an old VW, tho the factory never fitted anything quite like those!