Here is a very short clip of my dad's car with the ultra flows.

http://www.youtube.com/watch?v=yuYm6LlJCW8

I agree Magnaflows are probably the same! I have them on my car (440 Dart) with headers/an X pipe and this is how it sounds:

http://www.youtube.com/watch?v=h3d-jleaRhM

Towards the end is some idling sound.

That was before I had much of an interior in the car. Now with carpet it is actually pretty quiet inside.