To be honest.... I HATE the flowmaster setup, it drones so much! The backfire is nice though but that only happens when I let off the throttle at high rpms.
The intake came with the car when I got it but you can pick them up for about $250 I think. Just keep in mind, if you want to hear your SC whine a smaller pulley is not the key. Air Intake is the way to go.
Heres a video of my exhaust:
Or you could make your own intake for ~$35 and it works just as well.