Okay you Ford guys need some answers..?
1. Yes, I do. I got to test drive a 95 Mustang GT vert a couple of years ago. Even with what turned out to be a grenading dizzy (idled like *****), it still sounded nice.
2. Who knows. Grab whatever mufflers a 4.6L Mustang GT uses and be done with it. This is not rocket science, yo!