Many of the purveyor's of these devices rely on the general public knowing just a very slight amount about air and fuel from reading Hot Rod or Motor Trend, and then using a few well chosen buzz words in their ads. Turbulence was the big one for carb engines, as in more turbulence in the carb and intake manifold helped mix the fuel and air and keep it evenly mixed for better combustion. Thus devices like the Tornado. Then along came port fuel injection and we didn't need turbulent air in the throttle body and manifold for air fuel mixing because no fuel was in those areas. So now they promote "straightening and smoothing" the air flow through the throttle body. Of course, what they don't mention is that all that "straightening and smoothing" gets undone at the throttle plate.
Don't get me wrong, intake tuning does work, just like exhaust tuning works. But it is dependent on lots of factors, isn't a one size fits all proposition, and is only effective at certain rpm ranges. Thus it requires extensive testing and engineering to match up the intake, heads, cams, and exhaust to reap the benefits. Thinking someone can just come up with a one size fits all device that will provide the same benefits as thousands of dollars worth of parts and engineering is wishful thinking at best.
IMHO, the first tipoff on many of these devices is how they claim they work equally well on carbs as well as EFI, and don't even offer a different part number for the two versions. It's been my experience in life so far that one size doesn't fit all worth a damn, and that the majority of product claims are written by people with no actual knowledge of the product or how it supposedly works. They study human behavior and how folks react to certain words and images, not how products actually work (or don't work). The words and images can be totally opposite to reality, such as the ones with the carb on that web site, but they are counting on the fact that if it looks scientific a large number of people will believe it. The smaller number of people who actually know the claims are bogus don't matter, since they wouldn't have bought the product anyway. And thus the world of creative advertising and bogus products rolls on.
Jerry
BTW, I'm not trying to make anyone feel bad or stupid because they believe in these things. What each person believes or doesn't believe, and how each person spends his or her money, is not for me to say. I just offer my comments for those who don't know what to believe. This stuff persists because people buy into the hype, and then tell their friends how great the product is to reinforce in their own minds that they didn't really get scammed. Trust me, I did the same thing after spending $30k on a POS motorcycle a few years back.