I just had to chime in and say that I have seen advertisements for a patented version of this.
The company was out of Montana up by Flathead lake. They had a full page pull out advertisement in the Great Falls paper a couple of years ago. It had me convinced and I tried to contact the company but got no response.
They used a media to help purify the gasses. Made sense to me that the cleaner the air fuel mixture the better the combustion.

Maybe some of the folks up in Montana know of the place?
Michael D