if you want your car to stay reasonably reliable, I'd steer away from a nitrous application, even the little shot size that was brought up earlier. By no means am i trying to be a debbie-downer though lol these cars make torque better than they make hp so i'd say expect 185-190hp with 220-ish torque.
oh, and do yourself a favor and DO NOT get a trifecta tune, go with EFI Live tune via BNR (Bad News Racing) i am not an affiliate of BNR or EFI Live tuning software, I pass information based solely on results etc., im not even tuned so nobody can say im only saying that cause i have their tune or got a good deal etc. lol (yes thats happened)
that being said, although my car isn't tuned, i have seen both tunes at work, on the same car.