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I saw an improvement with my k&n drop in filter. Yes they are expensive, but for my 03 civic it works. My escort rarely went over 2k and never over 3k so the engine never really pulled enough air for a better breating filter to be effective(65mph is at 3.5-3.6k on the civic). I also like the convenience, yes you have to clean them(eventually) but i don't drive that much so it will be a while. Do not try to make your own filter, anything that accedentally gets into the engine is a bad thing. Get one that is made for your car...and don't get a sponge one as they don't filter for very long.
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