because the air in the engine bay is super hot...crank your car, climb in, and close the hood, lol...a cai pulls cooler air from "the road". iceman intakes were very good...i've had three accords, and i'm not convinced an h22 im won't bolt to an f22...may have to bang the firewall a little depending, but not sure...go to www.cb7tuner.com/vbb to get very good info on these engines and their mods, along w/ proven dyno numbers if you look around...