I had the AEM cai. I have the V2 and love it. While i was at the nopi nats i spoke to some of the engineers that worked for AEM, and they were telling me that i should be making about 5 more wph on my 99 GSR. I noticed more power across the the hole rpm band. AEM told me that the last body style Accord with the 4 cyl gained 20 wph with this intake. The V2 is larger from the filter to almost the throtle body then gets smaller. AEM tells me that the rate of air flow coming in through the large end is forced through the smaller end creating a much greater air flow rate. If you don't belive me call AEM and let them tell you.