hearing differences in exhaust

I was wondering if any1 knows somewhere on the internet where you can hear the differences in sound on different types of exhaust such as borla vs slp for the new gen gp's..........thanks

The link below has sound clips for both '97-'03 and '04 and up Grand Prixs so it may be helpful.

Click here (http://www.rmcgp.com/exhaust/)