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That flap is thermostatically controlled, so whatever you do, make sure that the air going in to the carburetor is kept at 100F, otherwise your engine is going to run to lean if the air is to cool.
That bit of ducting is the same size of course as the 1.5L engines used in the 4 wheel drive, 4 door wagovan, so I wouldn't worry to much about it in your CRX's 1.3L engines intake, you could look up what size is the ideal size for air intake tubing for your size of engine, but I suspect it will be pretty close to what you have as the intake on my civic vx is pretty close to that size as well with nearly twice the peak HP.
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