If you look really close at Beans set-up you will notice a corrugated hose that runs from the radiator area all the way back to the firewall. It goes into a cover over the fresh air intake for the vent. That way he still gets fresh air and has a strut brace.
The other day there was a photo of a ralley car with a hose and fan set-up that had a metal duck to the heater inlet.
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