As the video mentions, there are a actually few different methods/products aimed at emissions reduction. The reason this products is making waves is that
A) first and foremost, it is designed to fit a very wide-spectrum of engines,
B) it is an after-market addition ... which, in my opinion, brings with it a general sense of higher workmanship (case-in-point: after-market sound receiver/speakers vs. the factory brand), and
C) they have (allegedly) engineered their device to be high efficiency.
After viewing the video, however, I am convinced that SaVi *must* hire better spokesmen to handle the PR offensive. If all this talk holds true and bears fruit, then this is going to be serious business. Listeners correlate, correctly or otherwise, intelligence and trustworthiness with the manner in which a person speaks. Anyhow, just an after thought.