NIce car man.
Like HybridSS said. Get the whisper lid. Get the catback exhaust. I bought borla for mine and love the sound and the tips. I did not want just round looking ones. There is really no performance difference between my exhaust and anyother. Mine is maybe an 1 or 2 hp more because im running it without a restrictor plate.
Make sure you have a damn good shop install your gears if u get them. If they dont do it right they will whine.
Throttle body bypass is a free mod and will give u a few more horses.
Get a different torque converter too (youll feel the gains from this more than the exhaust or intake mods). The guys on camaroz28.com and LS1.com can give you a whole shit load of ideas too.