On a slightly more serious note engine manufacturers and engine tuners have spent years trying to find ways to get air to flow as smoothly and as rapidly as possible, into the combustion chamber. Where it is then mixed with the fuel.
So why would a device which causes eddies and swirls, breaks up the freeflow of the air and creates turbulance in the airflow be a good idea. The only place you would want this to happen is inside the combustion chamber or in the manifold when the air meets the fuel.
I have read plenty recently about these hiclones and how they improve the low down grunt and performance. Has anyone on this forum had any experience of them? Good, Bad, Indifferent? 
