A bare pod in the engine bay will give the least restriction, BUT will also be able to draw in hot engine bay air in start stop traffic. Great for induction roar, and for the highway, but I think you'll find increased fuel consumption and less grunt down low in traffic. The ultimate seems to be as big an insulated box as possible with large air feed from the front of the car, preferably in a high pressure area such as the front bumper area.
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