i'm pretty sure you can bolt on the h-pipe to your stock exhaust, i'm planning on doing this in a few weeks, and for christmas, get a flowmaster cat-back. If you get it done, post it and tell us how it went, i'd like to know how it went.
Tailpipes? Who needs tailpipes? 5.0 + Un-catted H-pipe + dumped mufflers = beauty to your ears. Your stang will sound so good, once you get used to it, you will never be able to go back to tailpipes. However, that set up with tailpipes will sound good to.
Thanks for the response guys, I really appreciate them all.
Right now I'm not really considering turndowns, I had a friend who had those and they constantly made his car dusty and dirty, plus I just can't get used to seeing my car without tailpipes. Thanks for the suggestions though.