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Or I can keep it short to save time. drawing the air from under the car is inefficient because of already turbulent airflow. Removing some of it and discharging it out the back isn't going to do any good becuase you're taking turbulent air from 1 area and moving it somewhere else. It would lower the air pressure under the car which will screw with aero on the sides, same way your rear window aero is weird due to air coming from the sides and wrapping around. I imagine there's probably a really good reason why you don't see it on racecars. The only racecars I can really think of that relocate the radiator in any way are some rally cars, where aero is minimally important. Probably the best cars to look at for ideas would be NASCAR racers, since they are required to keep the radiator up front. All the ducting you'd have to run, not to mention the weight of the fans to pull the air up is just going to be extra weight that's going to make the air leaving the car turbulent as heck.
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