Here's another link that Mercedes Benz E Class uses the same Tornado principle in their engines. It states the following:

"Each cylinder is supplied with air through two inlet ducts. One of these is a spiral swirl port designed to generate a fast-moving swirl movement and the other a tangential port optimized to ensure effective filling and high output. The spiral swirl port whips up the air into a fast-moving swirl before it enters the cylinders, ensuring an optimum mixture of fuel and intake air under partial loads."

Here's the Press Kit report for Mercedes Benz:

http://www.autospies.com/article/ind...articleId=4565

http://wwwsg.daimlerchrysler.com/SD7...-67956,00.html