I'm always incredibly dubious about things like this! Unfortunately I can't view the video that explains how it works, but i've got a good idea based on the emissions results.
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The major pollutant in the exhaust, carbon dioxide, is down by only a fraction.
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*cough* That's because CO2 is directly relatated to how much fuel you burn.
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Your carbon monoxide emissions are down by 80%." Richard said. "And the hydrocarbons are down by 50%.
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So you're getting a more complete burn because there's more air? Shocking stuff!
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The catalytic converter, which has never been changed since the car was built, is probably cleaner than it has been for ten years."
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I'd love to hear how that's the case!
Also, no word about NOx (That I can see anyway).
I'll have to wait till I can see that video and I read more 'technical' reports on this product before I decide what I think of this. I'm still skeptical though!