If your looking for quiet I would go with either magnaflows, ultra flows, or the pypes racepro? I think they are called. Prosport had them if I recall on a his 9 second dart sport, said they were quiet and performed well. Maybe he'll see this and chime in.

Me, I like loud...I went from Borla XR-1's to dynomax bullets because I wanted louder lol...Street car, I drive it for over an hour at a time, noise does not bother me. Then again, I am only 24 and starting to notice some hearing loss