BTEMY,
If you have existing aftermarket exhaust pieces, I think you should purchase all additional parts form the same vendor if possible. It's hard enough to ensure a good fit without throwing multiple manufacturers into the mix.
First, spray penetrating lubricant on all fasteners the night before. PB Blaster will work, but it's at the bottom of the quality spectrum of penetrating oils though a bit better than WD40. I use Mouse Milk or Kroil, which are both very high quality aviation grade products that out perform the other stuff on the market by a large margin. A 1 to 1 mix of ATF and Acetone is about as good a penetrant as anything.
As far as disassembly, I would suggest separating all "slip joints" (between midpipe and muffler) and thoroughly cleaning them with a brass brush (a brass wire wheel on a drill is the way to go). Make sure you have some high temp anti-seize on hand and coat the mating surfaces of the slip joints generously.
If you do the above, it will make articulating the slip joints much easier and help to ensure that everything can move as you position the exhaust.
Fit everything loosely and the start tightening at the parting flange where the header meets the mid-pipe and move aft doing your best to make sure that the pipes are not binding (some of the connections may be slightly stressed, but try to keep it to a minimum).
Good luck!
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