It maybe something that works in conjunction when the underbelly pans are in place.

Seems like it would ram cold air to the mount location which disperses it and hence also cools the pre cats area.. and finally exhaust out from the opening in the pan - Otherwise the only air coming in would be the through the radiator..

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)