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"...Having not thought about very long, my guess is the geometry of the duct downstream of the heat exchanger is not that critical - its sure to be better than the crude practice of directing the airflow at the engine block which results in most of it being deflected down..."
I disagree. NACA et al found that the ducting downstream from the heat exchanger and back into the slipstream is just as important as inlet design. In other words, inlet ducting is only half the job, which is not finished until efficient outlet ducting is in place. This is why NACA et al developed cowl flaps, etc..
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