As a former employee of (name withheld) and fabricator of the (I don't want to admit it) CAI, I've seen first hand the HP improvements. I've seen the minimum of 5kw to the bigger 7kw gain. If you are getting no gain what so ever, I'm lost for reason. Did you have the full 3" version or the 3" with the 2.75" MAF insert? I know (my former employer) are very lazy at getting back to people with info regarding ANYTHING, hence, why I now fabricate things and work for myself. You could also try this thread with links to various CAI threads. http://au.toyotaownersclub.com/forums/topic/5503-previously-covered-topics-have-a-read-before-posting-as-it-may-already-have-been-covered/