The kit comes with everything you need except one important thing... the nuts for the flange bolts. You can re-use the old ones if they're in good shape, but one of mine rounded off pretty good during removal so I'd recommend having new ones handy. Also have a saw-zall or other cutting tool handy because your old exhaust probably won't come out in one piece. I cut mine in half and it came out easily at that point.
Rather than using extensions to try reaching the nuts...I just dropped my t-case skid. Prop up your t-case using a 2x4 or something, remove the 4 nuts in the center of the skid that attach the skid to the tranny mount, then slowly loosen all the large bolts on the skid (I used a lot of PB Blaster and then heated them before attempting removal as I've heard the nutcerts like to break off--then I used a breaker bar and gently applied pressure until they broke free). I used bungee cords to hold the skid once I removed the bolts which made reinstallation a breeze.
Once you get all the old stuff off, installation is a breeze.