Header, Intake, & Exhaust - v2 performance gains

Hey my friend has a prelude and told me that he fund a graph showing the performance gains when adding the aem v2 intake for his prelude. I was wondering if anyone new what the gains on a 2000 honda civic si would be.

Maybe 3-5whp. Chances are, the graph he found was from an AEM ad, and probably said something like 12-15whp, right? Rarely are independent dyno tests done for just an intake; the dyno testing itself usually costs more than the intake. Personally, I wouldn't trust numbers coming from the people who make the product or the people who compete against the people that make the product.

Yea I mean I figured that it wouldnt be much at all of a difference, it just I have read that it is the intake that gives you the most gain. I was just wondering if there was an exact number or something like that