The passenger side midpipe to manifold nuts are....fun to get to.
Be sure to hose all of the bolts down with insert penetrating fluid of choice here a few minutes before starting removal. It wouldn't hurt to get a spray a day or so in advance, to let them really soak.
With my Mac offroad X, I used the Mac gasket, and stock studs, and everything came out great. I've heard many mixed results, some being people having to get a better gasket, and replacing the manifold studs.
I don't think that applys to all mid-pipes, though. Just Mac.
You're going to need to get some MIL eliminators, which you have a few options on. You can either dish out for the nicer clip in ones, that go between the o2 connectors, get the splice-in ones (I have these, no problems so far), or try the do-it-yourself eliminators, that act just the same as the splice in ones, composed of parts you can pick up at Radio Shack. I think I got my splice-in ones for like $10.
Just remember. Be patient! I've seen so many half done jobs, where nuts were stripped completely, turning a mere Three Mile Island into a Chernobyl. Good luck!