I just did a ste search and found quite a few, especially if you search the archives. There is a Borla sound clip in the Members- Projects Exhaust Sounds.
Wayne Foy has my old Borla Cat Back system on his ST. There are pics of it in my library off of the ST from when I was selling it. Had a mellow sound, not too loud, but not nearly as quiet as stock. It was on my ST for a good while and weatherd very good. It was stainless steel, and I paid around 600 bucks for it when it first came out. They are considerably cheaper now.