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Originally Posted by Talos Woten
Anyhoo, I wouldn't put it past some clever engineer to design a virtual diffuser using the heat from your muffler or somesuch.
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This was just a thought experiment, it doesn't consider intake air:
The stock VW Beetle has about 1500cfm of hot, corrosive exhaust gases and 1500cfm of engine cooling air. A 4-into-1 header feeds a 90 degree elbow into a vertical stainlees steel stack perforated on it's front face. It is surrounded by a stainless steel heat shield forming a Coanda Nozzle conforming to the shape of the truncated boat tail.
The engine cooling air is open to the bottom of the stack and is entrained and sucked out of the cooling ducts, augmenting the stock fan with it's undersized pulley.
"What do you think sirs?" MST3K