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On the 182's i think it's quite straightforward. 172's it's a ballache.
having said that... on mind the cat > centre section join was a total rusty mess.
It's essentially 4 bolts. 2 at cat > mani and 2 at cat > centre section. buy all new bolts for when you re-fit including the wire gauze type gasket thingy (technical) for the cat > mani join.
The only problem i can see you coming accross is badly corroded joints and bolts.
you'll probably need a fitting kit or something from Ktec. Bolts will probably be no good for re-use.
182 is straight forward. 172 you can expect to bleed.
172 was a totally pain from what ive been told, got a garage to do mine and it took around an hour of there abouts with 1 1/2 guys doing it. 182 manifold and de-cat ftw if you can afford it