Has any one tried this yet

I was slumming around on American Muscle's web site and yes I know it's a Mustang site and no respectable MOPAr Gearhead would be caught dead there but I saw this and it looks interesting. I currently have Flowmaster 44's and don't care for the sound. http://www.americanmuscle.com/bbk-varitune-muffler-stainless-25in.html . I don't mind popping the $130 each but if anyone else has tried them I would like to know.

Bobby