Just bought a 94 camaro, need help

ok so i just bught a 94 camaro IROC z28 v8 5.7 automatic, im 18 and this is my first nice car. its rly clean with 94k miles, all stock except a sound system / flowmaster exhaust / custom wheels, nothing that effects performance rly. im trying to learn more about cars, but i have a long way to go. my q is, how much HP does it have? ive searched and i think it may have around 275. what would be the cheapest / best way to add speed to my car, i know this q seems retarded and general, but id appreciate any help. i dont want to drop thousands into it, but would a few hundred make any difference? thanks for any help.

first of all, its not an IROC, its just a Z28. chevy didnt make an IROC after 90. second, i would say that with the flowmaster, you are prolly right around 280, stock is 275. third, if you dont want to drop tons, i would say get yourself a cold air intake system, maybe a reprogrammer. i dont have a good handle on how much you want to spend. youre not gonna get much for like 300 bucks, but that might be a start...