Hi! I saw your thread and would like to get the benefit of your experience quieting down my 2006 v6 mustang. The guy who had it before me put a dual exhaust with pypes street pro's and a bbk cold air induction system. I replaced the mufflers with stock gt mufflers but find that they are still too noisy especially at 2000 rpm. I would consider mid mufflers, but talking with the guy from walker, he said that I wouldn't be able to hear any difference. Exactly what did you do and how successful were you in making your mustang quieter than stock?