Hey Cujet, Bob G and I discussed this idea a while back, but I was angling to raise exhaust temps for a pseudo-cogen system I have been working on for a few years. Unfortunately I had a bad fall in March and have been unable to pursue pretty much anything since.
I pretty well trashed my shoulder and cracked an orbital socket. I'm 60 and don't heal so fast anymore!
At any rate PM him, he sent me links to a few promising units IIRC.
Ron.