Those things are completely worthless - unless you also buy the snake oil to add to your tank every fill up, equal parts oil to fuel. Then I'm sure you'll notice a difference... uh, in something!

It really upset me when I saw them advertising this product in the back of Motor Trend magazine - I mean, yeah you want to sell advertising space to make more money, but they really need to be more selective with who they sell space too - b/c it can turn into a tabloid of false advertisements back there!

When it appeared on Two Guys Garage (a show I took as "serious") - they threw their credibility right out the window! Now I will never know if I can believe what they say. Again - they were just selling advertising space where the 2 guys show you "new" products instead of using commercials. I would have been much happier to see a few dyno runs, or a complete tank of gas programmed dyno run with one in vs without. Swirling air in a soda bottle looks cool, but I'm not sure if it's a good idea in your intake.

Plus - as mentioned - if these types of cheap products were so great, why wouldn't major manufactures use the technology? Hey - a 10% increase in fuel economy and hp, and it won't cost $1M in R&D?! Where do they sign up?!

Reminds me of the little sticker thingy they sell to put on the back of your cell phone that increases the signal strength by double, and reduces your chances of cancer, etc etc. And it's only $15! Hmm - wonder why the cell phone manufacturers don't use that then...

It's unfortunate that we as consumers aren't experts in mechanical engineering, as well as hydro, electric, chemical, air, etc engineers. When a product comes out, they market it to sell, no matter what it actually does or doesn't do. And we as poor consumers who don't have the technical knowledge are left helpless. That's why garbage products are worth making - b/c they will sell for a couple years before people wise up and see that it's garbage - then the company puts out another garbage product for people to try. Making it cheap is a way they sell more - for $20 people are willing to take a risk it won't actually work, and not be upset! If it costed $200 and actually worked - it probably wouldn't sell very well b/c of the price - people wouldn't be willing to spend the money to see if it actually does work. Sad.