This has a cooling air inlet that mixes with the exhaust
gas on the way out. Similar to our cool tube design but
reversed. The outer body is 321 but the inner parts
are inconel. Mistral will sell it with a $1000 ball park
price.

BTW When you buy a Lycoming you don't get a muffler.

Contact.
http://www.mistral-engines.com/
-- 
Paul Lamar ...No rotor no motor.