I have attempted to convert to "ram air", but the space next to the CPU is very limited. If OE long duct is used for this purpose, the only possible configuration forces the duct into 180 deg bend, which partially defeats the purpose of this modification.
Next, I will experiment with aftermarket 3.5" dia elbows.
Here is my Ram Air solution:
one 3.5" dia silicone 135 deg elbow, trim ~1" , one end
one 3.5" dia silicone 90 deg elbow, trim ~1" , one end
50mm section of the aluminum 3.5" tube
4 Norma clamps
Tube has to be slightly squeezed to form an ellipse to clear the tank inlet tube.
Clamps on the tank pipes have to be re-clocked to avoid interference.
Short, smooth bore duct, easy to make, under $50.
Thank you eBay.