Yes, unfortunately gears are too much to do otherwise that would be the number one option.
I don't personally have any experience with the ported throttle bodies but from what I've read guys are really liking them. They definitely improve throttle response and will flow more air. It would probably be a very nice addition to your CAI and exhaust with the hemifever tune.
Headers will also flow a lot better. But have you done a Y-pipe? I would be doing that before anything if you haven't. Especially before headers.