I was trying to be friendly with my first post and suggest that you spend that money on other mods before you go to such lengths for weight reduction... but your absurd reply requires me to be a bit more blunt.
You hardly have any mods. If your goal is to be "fast" with an auto GT, you're going to need serious power mods. I don't care if you strip the car to an engine, chasis, seat and wheel... it'll still be slow. All the fast autos you listed 1) have more than 4 speeds & 2) have more than around 100lbs or torque.
People are always saying that autos can be just as fast, just look at the supra/AMG/whatever... the tranny in those cars is NOTHING like ours.
Basically, knock yourself out with the mods. You can make the car faster than it is now... but it'll never run below high 16's to low 17's in the quarter unless you go F/I. Even then you're looking at what, high 15's?
There are just sooo many more productive and less ricey mods for the money.