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If the part in question is the first item in the air intake system, it's probably an, air intake muffler, to combat a harmonic whistle in the system at high engine RPM.
It may not be a Ford part , because Ford almost always has there logo or a P/N on such items.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.