How to make this car sound louder/better?

I have a stock 04 Pontiac Grand Prix GT and I want to make it have a little aggressiveness to it. It looks nice and has plenty of mods but didn't do anything to the exhaust system… So basically I'm wondering how i can make the exhaust noticeable instead of that little belt moving whining kind of sound and being so quiet I want it to be loud enough to hear but not all rice like most hondas out there… Links would be helpful too, thanks!

Added (1). Answer by G6er I actually have a 3800 S3 engine in it, and any chance you could get me a link if it still gives the same sound boost?

Cold air intake kit… About all they are actually good for is making more growl under the hood, but they do that well.
And I would suggest magnaflow mufflers at the back. The 3600 series engines actually sound terrible in my opinion with a full exhaust done. They get Really raspy.
I have a 3900 in my G6 and I was really concerned about it sounding like a GrandAm with a hole in the muffler. So I kept the resonator, and only did an axel back system with dual magnaflows. It sounds perfect, wish the car had come that way. The exhaust is quiet at idle, so you don't wake the neighbors when you come home late, but when you get on it, it has a really nice tuned sound similar to a Porsche. (from what others tell me)
It's also not annoying on the highway it's just a nice smoother purr
highly recommend it for these types of engines. Stay clear of Flowmaster for the GM v6 blocks… Again. Just my 2 cents