The same volume of air is flowing through the grille to the hx and radiator. The HKS guide just allows for more air to flow up through to the intakes. There are some holes in the shroud where the HKS ducts would be.It looks amazing.
One question: without the HKS intake scoops that require cutting the stock airboxes and core support, aren't the holes in the radiator cover panel just letting air bypass the radiators/heat exchangers?
What kind of air intakes do you have