The exhaust has a nice sound - I wouldn't say that it's quiet, but it's not overly loud. Quite literally everyone who heard or rode in the car LOVED the sound. There are several videos on YouTube. This one:
http://www.youtube.com/watch?v=KzEcEUt_aB8
Illustrates it pretty well. The black car, about mid-video, is what my 986 sounded like with the muffler. I think the ones where they are revving it up have the wide-open mid-pipes. I ran mine with cats in the mid-pipes, so the sound wasn't that loud. I have the cats available as well.
Please email or PM me and we can talk price.