[aerohead]

When the second-generation CRX came out,Honda had abandoned the upper grille entirely and relied solely on the bumper/fascia inlet for all internal flow needs.Looking at the photo of your CRV,I'm thinking that because of the layed-back rake of the upper grille,that it probably resides in an area of lower pressure than the lower grille(which should be at the forward stagnation point for the car),and that if anything,you would want to close off the upper opening.According to rocket-scientists,a diverging, air-tight inlet duct,one radiator-height long,and one-quarter radiator-height tall,at it's opening,will provide all the air at the minimum drag.With respect to the skid-plate,the "windward" face will be at near the stagnation pressure,and once behind the "turn",under the car,the pressure will drop as a consequence of being converted from static-pressure, into velocity.