Now this is interesting! Check the application area of exergyengineering dot com
Looks to be closed loop and water cooled exhaust. Wonder how they handled the electronics.

Long overdue .
http://www.exergyengineering.com/application.html

The old Tommy Bajamas boat is having this application (Duramax's) put in it. There's pics floating around here somewhere.

I thought IMCO did this for the MTI