Ok this is an odd one.
The prior owner had just installed this at some crazy expense. But in the course of the refit we decided to totally reroute the exhaust and go with a more compact waterlift. Was on a Westerbeke 70.
3" exhaust outlet, 34" high. Custom made by Marine Manifold Corp, NY. You can see their stuff on the web.
I have no idea what to ask. Give me a reasonable offer.