A Khamis collector is a short/light scoop that hangs off the end of the end of the RCE bracket that sticks out from behind th wheel to gather air flowing under the car instead of using hoses.
The additional unsprung weight should be close to zero compared to the weight of the hose, and it should work fairly well on cars without front splitters/lips/skirts. I expect it to be a track "clamp on" kind of like the SuperTrapp now is.
You could even use the Subaru "Brake Ducts" to point air at it.
And Mike keeps talking about doing something like that, so thus the name.
Unfortunately to clear at full lock, it has to make a hard turn just after the exit from the RCE piece, so nothing "off the shelf" so far looks like it will do the trick. I am looking at some 16 gauge aluminum mandrel bent pieces, but wish they were 20 gauge or so. I need HVAC thickness, not intercooler piping thickness.
Dryer vents are almost the right size and shape...

But not quite.