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Originally Posted by tbaleno
I think on civics in general bolt ons like air filters and stuff don't do much. I hang around on a 7th gen board and thats rule number one to tell new people before they waste a lot of money.
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One of the first rules of performance is that better airflow == more HP, and dyno tests prove it. Take the paper out of a paper filter and try breathing through it... You just can't, it's that restrictive. A K&N is proven to give you a few HP. Yes it's only a few HP but why NOT get a few more HP? It's not like the HCH is overpowered or something...
As for decreasing mileage, that's highly doubtful. At any throttle position other than WOT the ECU is going to have no problem maintaining a constant fuel/air ratio even with a less restrictive air filter, since the throttle is inherantly limiting the airflow it's not going to go out of bounds on it's curves. At WOT it's POSSIBLE that it would go out of bounds and MPG might suffer but it's unlikely, most manufacturers put some extra wiggle room at the ends of their curves to account for slight variations in performance.
Why doesn't Honda use one stock? Who knows. Why don't they use LED light bulbs that are more efficient and last longer? It's false to assume there is no room for improvement.