Old stock for carb set up...flex pipe to air filter housing goes on there...
I didn't know any engine ever came with tube headers back then. All I ever saw were cast iron manifolds. That hot air inlet looks like a homemade add-on.
1989 Blue LX Hatchback
2001 Red SVT Cobra Convertible (Phoenix)
2002 Black/Red GT (Ginger)
2011 Red Candy Metallic V6 (Manfred)
2016 Magnetic Metallic GT (Susie II)