This is coming from a G3 owner but:

If you're planning on going turbo, don't waste money on a CAI and a header. I'm not familiar with the suspension choices for a RSX but I would target that with the $3,000 first.

A CAI by itself isn't going to do much, pair it up to a decent Header/hi-flo cat/exhaust and then you have something going.

Shingo