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To get an idea of what an intake will really do for you just look at the dyno testing that magazines have done. Import Tuner for example did a column called "2001 import tuner top 10 power page products of the year award" In it:
-AEM cold air intake: 6hp on '00 civic si
-Injen intake:11hp on '99 eclipse gs-t
-Hayame intake: 5.2hp on '01 civic ex
-XS intake: 13.9hp on '02 WRX
keep in mind they chose products which made very good hp numbers for a particular car, not just which made the most power straight up. If that was the case they would have tested all products on, say a supra. But what they're trying to do is show the best products for a wider range of vehicles because what works best on a supra probably won't work best on a civic si like yours.
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