This item was removed from a 1947 5.4 HP Zephyr Evinrude Outboard.  The model and serial number are 4404-02077.

This is a: Exhaust Housing & Tube - I think something was living in the upper portion of the housing so you may have to clean it out a bit.        

Stock Number: 20H-JG

Inventory ID: P7701 - 4