Have acquired 4 exhaust components Marked Kiekaufer Aeromarine
and serialized. Approx. 5" dia can with 3" inlet pipe. Made of chrome plated
stainless steel. Approx. 18" long overall. Have mounting plates and vacuum
cylinders on each one. Inlet flange is square 4 bolt. Any idea of origin,
application, value?

http://i.ebayimg.com/images/g/0lAAAO...VDe/s-l500.jpg

http://i.ebayimg.com/images/g/TL0AAO...VIz/s-l500.jpg

http://i.ebayimg.com/images/g/ilUAAO...VAD/s-l500.jpg

They look like old Mercruiser exhaust risers with built in switchable mufflers.

So they are production parts, nothing special? Any idea of value?