I don't think Bassani or Magnaflow will sound anything like your
Flowmaster weld in mufflers because they sound more smooth and
louder pitched to a point but,you are comparing chambered mufflers
to straight through designed mufflers so,it would be hard for a
straight through muffler to sound like a chambered muffler.In my
opnion Borla will sound the closest to your Flowmaster mufflers.
The Borla catback will roar and be deep and throady just like your
Flowmaster mufflers but,in my opnion will never sound as good as
Flowmaster's.As the Flow's are deep,raspy,throady,and mean just
like a real muscle car should sound.I think it's a matter of taste
Josh.Go to
www.mustangexhaust.com and listen to the sound clips
and see what muffler you like not what everyone else likes.