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Power gain of 5 to 6 hp on a car that already had header and exhaust is very average for a CAI. BUT, $159 for the intake is about the same as you pay for a AEM basic CAI on ebay, so i guess it just depends on whether you want the hassle of installing the AEM, or the simplicity of this cf intake. Doesn't look like a bad deal to me man. I'm thinkin of gettin this myself now. hehe. If you want better power gains, think about gettin the AEM V2 intake. It'll run you at least $250 on ebay, BUT your power gains should be closer to 10 hp. If it's worth it to you, and you arent afraid of driving in heavy rain and losing your engine due to the location of the AEM filter, then go for it. But i personally don't think 5 hp is worth an extra $100+. Go for the carbon intake dude.
Another thing to take into consideration is the location of this filter. You'll be sucking air from the engine compartment, which after a few minutes of hard driving, is gonna be hot as hell. You might wanna toss around the idea of making or buying a custom cold air box that fits in teh same location as the factory box, but still with the fatter intake pipe and the high flow cone filter. Just an idea.