The whole idea behind the V2 is to use the sound energy created by the rushing and sudden stop of the air in an advantageous way to help boost power. It's the same principle behind velocity stacks and carburetor bowls from the 50-70's. In other words, it doesn't really do you any good to compare to a stock intake system, but if you instead compare power output to a similiarly equipped engine with AEM's original intake, you are likely to find an increase of 25-50% to be added of their original design [V2gains= Original +(Original*.25 or .5)]. I'm all for saving money and pointing out false marketing when I see it, but AEM did their homework on the V2, and due to the time they put into mathematical modeling and such, you are not likely to see any rip-offs that come anywhere close to AEM's numbers.