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First off, I'd say you need to get a tuner or go to the dyno and have them tune your car up. With a tune and some DR's and a 125 shot, I believe 12's are possible. Good luck and watch it with that 125 shot, I think 100 is playin it safe.
I dont know about the pre 99 GT's, but a 99-04 GT with some DR's and 100 shot could come close to 12's. I think you could do it just because of your mods already and it says you run 14.4's already. So it will be close, but I hope you get it.
just be careful with the nitrous and make sure it is installed and tuned exactly. I've seen too many engines go BOOM due to improper tuning or over nitrousing.