Olee, that's a good piece-- very well made, judging roughly by the pictures.
I am wondering how much of a restriction the actual heater grid is. It seems to be designed in such a way as to minimize restriction. But there's no doubt that it IS a restriction, even at stock power levels.
Then we try to stuff twice or three times as much air into the engine! Certainly, this is one of the details that will help increase the amount of air that the cylinder actually sees.
Thanks for tooling this up. Any test data yet?
jlh