I have RE intake, BB midpipe, BB cat-back, and I have noticed a big differance at about 5000 to 7500. Suit yourself, but for a car that needs every HP it can get; I think that these mods are well worth it. The HP gains are all in the high RPM, which is good for track.
I took my car to the track when stock, and then with all my mods. I found myself having to shift up to the next gear, because of my increased HP.