First Car - exhaust sounds like ....

I just got a flowmaster exhaust on my stock 87 el camino (305)because it needs to be smogged and it had an exhaust leak. Its my first car and i wanted it to be loud so i got 40 series original flow mufflers. The exhaust is like a Y pipe with 2 mufflers and the old, rusty catalytic converter stayed on. I was really excited when i went to pick it up and my dad started it and it was extremely quiet. I couldnt even notice much of a difference. Does anyone know what is wrong or what i can do to make it louder????? In the future Im gonna get a remanufactured 350 and headers and probably a high flow cat. Any help is really appreciated