It may not be quite what you are thinking of, but I have a Bernard Scouse airbox. Because this places the air filter inside the nosecone, I have constructed a "partition" that protects the filter from the air flowing through the radiator and ensures that the filter draws cold air. This has the effect of reducing inlet temperatures by about 10 - 15 degrees C. According to the temp guage this is about 5 deg above OAT but since I have positioned the temp probe in the backplate of the airbox, I suspect that the probe is being affected by radiant heat from the engine and the actual inlet air temperature is probably nearer the ambient temp. I think Tony C achieved much the same effect by fitting an air filter with an angled neck that positioned the filter out of the warm air stream from the radiator.
I can send you photos of my set-up if you let me have an e-mail address to send to
SV 52 CAT - moles fly - here