Bill, I will put that on my list. Current inlet's are pretty close to the prop. Medial edge is within an inch, lateral edge is farther away.
I did fly a test flight with inlets removed. This decreased cylinder differential air pressure by about 1/2" of water and raised CHT's around 10 dF, so the current inlets are helping. I suspect the inlets would be more efficient if they had an aerodynamically round leading edge versus the sharp edge in the current inlet.