AEM gets the most consistent good reviews from what i see. i didn't know K&N makes a true CAI (sucking air from headlight, behind bumper, or other place far away from the engine heat) btw.
whatever you choose to drop your hard-earned cash on, make sure you see a dyno chart with the measured gains on a car similar to yours before you buy....good luck!
wala akong makitang dyno chart ng iceman, yung aem nakita ko na. i forgot which site pero may nabasa kong comparison ng CAIs. AEM yung top followed closely by DC Sports. Di kasali ICEMAN dun sa comparo e.