I love the sound of the Magnaflows! I have also heard that they are to pretty to put on your car because of the mirror stainless steel chrome shine! If you want to hear the magnaflow's in action, you can go here:
Magnaflow Mustang Catback (Mustang) and then click on sound. You will be able to hear two sound clips of the maganflow's in action. They are on a 93 GT, but I assume since you have a 5.0, they will sound the same. You can also find pictures of the catback on there.
Hope I was able to help. Also, to compare different exhaust sounds, you can go to
Mustang Exhaust and go to the sound room.