The only reason this product reduces pollution is that it dilutes the exhaust gas with fresh air. If you look at the abstract of the unspecified patent listed in the web site, you can see that this product syphons out the pure engine exhaust and mixes it with fresh air. So, it is not reducing pollution; it is merely diluting it!
And notice, there is no information on how the emissions test was conducted. The probe of the analyzer is usually inserted quite a few inches into the exhaust pipe, to make sure there is no exhaust/fresh air mixing. Did they place the probe in the undiluted section?
It sounds like giving all the information would not be to their advantage.
Aaron