what the guy from aem told us is that the v2 uses sound waves from the intake to create in (his words)boost... he said that the v2 is bassically a regular aem cai with a larger diameter pipe over it and the space between the two pipes uses the sound waves to produce what he says is about 1/2 pound of boost..The guy i sold my 2000 si to put one on it and you can only really tell a difference around 6500rpm and up and its a lot louder too