Good question SW2, I have the instructions from Alldata if you need them.
It says it takes a moderate experienced mechanic 4.6 hours, because you need to remove the power steering stuff, fuel rail, intake manifold heat shield, vaccum hoses, air box, and intake manifold. Although I think jeepco just lifted the engine and welded the cracks on his.
I'd also like to know where's a good option to buy because the dealer is just too expensive for the exhaust manifold.