I don't think he was working with the latest acuity CAI, the prl cai is not quite as good. Doesn't look like he is even tuning the civics anymore. One thing that makes the acurity cai special is the real carbon tube that keeps the air temp low. Perhaps you could copy the latest CAI design. i think the cai intake have gotton close to perfect. K+n use to be the best but is not even close now. Anyway its very simple more cooler air comes in , the more power it can make. The stock setup is good but a 3.5 CAI is much better. To get the most out of a 3.5 cai req's a bigger exhaust pipes to actually see gains. Cai by its self just gets stopped by small exhaust pipes and double cats -the worst pipe of junk honda put on cars.