looks like a pretty normal full pipe, with a very! long manifold and what are those on the pipe? cooling tubes?! with that big bracket at the back and those tubes i'd say it was for a power boat. tho im not sure why you would cool the pipe, maybe to protect the boat, but... are those tubes also at the engine mount? maybe thats a smoke system of some type for a plane, and the tubes are the pre heat.
i think i'll stick with power boat tho