I'm sure at one time,this idea was tried,and found to have too many negative attributes.
Then they did it like this,slowing the cooling air's velocity with ducts.
Small opening to large radiator,just like when Edgar Schmued designed the P51 Mustang's radiator duct.https://en.wikipedia.org/wiki/North_America...and_development
Geoffrey de Havilland did it too,1937 or so.https://en.wikipedia.org/wiki/De_Havilland_...ito#Development
https://www.google.ca/search?q=racecar+cool...r+cooling+ducts
Your choice of intercooler placement seems like a giant slowdown windbrake device,a plank in the wind.
Does your racecar have a passenger seat?A lot of room there,down low in the middle and out of the wind.
Click to view attachment
Create large pressure differentials on the sides of both rads with 'ducting'.
A snorkel duct to the intercooler will get a good flowthrough and temp and pressure diff.
I've seen people use packing tape covered cardboard to try out their ideas and later fabricate them of cfrp.
https://www.google.ca/search?q=fiberglass+o...-VkRSuYFhWmM%3A
https://www.google.ca/search?q=kitplanes+ai...roud+fiberglass
https://www.google.ca/search?q=epoxy+cfrp&a...PxRBNi2EnlnM%3A
https://www.google.ca/search?q=flying+wires...5mIs0kzqkJ0M%3A
The why of it,really.Streamlining of wires,the opposite of the thick foam covering of rollcages.
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Another technique is the stretching of synthetic fabric and epoxy soaking,a layup on the resulting form,or plug.
Sometimes the form is incorporated into the part,as for speaker boxes.
https://www.google.ca/search?q=speaker+shro...nPnDM_1waATM%3A
https://www.google.ca/webhp?sourceid=chrome...+east+coast+usa
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So our car actually has a large circular hole as the passenger's feet. I believe that was used to duct air toward the aircooled vw engine that used to live back there. We could utilize that duct. But for the time being, I just want the car to run/drive/stop. It hasnt moved under its own power for 4 years.