Why does Volkswagen have a water-cooled exhaust?

Why does Volkswagen have a water-cooled exhaust?The Volkswagen Group loves its EA888 engine, found in popular models such as the Volkswagen Golf and Audi A3. This is the turbocharged inline-4 available as a 1.8-liter or a 2.0-liter and with power outputs ranging from about 170 to a bit over 300 horsepower. It also has a unique exhaust manifold that’s embedded right into the cylinder head. This…

Via: http://www.motorauthority.com/news/1111198_why-does-volkswagen-have-a-water-cooled-exhaust

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