Sorry for pulling up an old thread but just came across it.
Their website says that some manufacturers already use a product like this, but I've yet to see one in all the intakes I've taken off of cars. If this concept could work EVERY manufacturer would use it, especially in the light of cars needing to be 'green' and have lower CO emissions. This reminds me of the TurboFlo which is banned for sale in the USA (even though they still sell them here in SA) because testing proved that all it actually did was reduce airflow because it basically just got in the way and as a result fuel consumption INCREASED.
In case anyone is interested, I've been using NF Petrol Saver in my 1.8 VW Polo and my average consumption (after using it for nearly a year now) has dropped from 8.2 litres/100km to 7.1 which for me makes it worthwhile:
http://www.nitrous.co.za/products.fuelsaver.php