I watched a TV commercial on this gazmo. It's a stainless circular insert that has perforations/slots punched into the circumference and some flap-like pieces that are attached to the inside. It supposedly works by massaging the airflow through the intake snorkel, has no moving parts, and looks to me like something I could make in my shop on a Saturday morning with about 1 sq ft of stainless stock and some tin snips and punches. Of course, that would require a pattern to duplicate the 'patented' slots, which explains the lack of a clear picture on the internet. If anyone has a picture, please post so we can all make one up and start saving big $$ in our Benzes.
BTW, here's a similar product that makes outlandish claims too. The installation instructions say 'wear work gloves when installing' (so your fingerprints don't get on it and someone can prove you were the gullible idiot who bought one?) and 'keep away from children' (so they don't laugh in your face after you explain how it works?).

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1986 560SL
2002 Toyota Camry
1993 Lexus