based on prev exp.. CAI will be well spent.. if you get it installed with the other things.. such as piggyback, chip, whole exhaust set, ignition, and not to forget.. great mechanic to set-up.. by the end.. all of these will cost you a fortune.. and it's just a matter if you wanna spend that much..
If you decide to go with CAI only.. there might be a slight improvement.. but I can't really feel it tho..