I am really thinkin about buying a CAI. First of all I would like some suggestions on a tru CAI, because I have heard there is a huge difference in some of them because some just use hot air. Also, is it really worth the 150 dollars or however much? It adds like 6 hp right? And is it tru that it improves gas mileage and by how much? Also, does it void the warranty if I install it, because I did buy my car for the warranty. Gettin it installed probably wouldnt be too expensive, but its still extra money which blows. Feel free to answer my 2345345 questions lol.