If I'm reading the GCR right- if I attach my brake duct hoses to an air dam, I can *only* make 3" holes in the air dam, correct? Can I not have a naca-style inlet scoop that the 3" hole attaches to? It sounds like if I attach the duct hoses to the stock bumper cover (in this case a 90 Civic Si hatchback) then I am free to have 5"x7" inlets for the brake duct hoses.

Is this correct?