These finally came in after dealing with a bit of a headache.
I got the factory exhaust manifolds off, not without breaking 6 F'n exhaust bolts though! I haven't messed with them yet aside from putting kroil on them at least once a day. I also destroyed the EGR tube so I'm going to delete it. I test fit the headers and verified they'll work. I've sand blasted them, primed and painted them with VHT header paint. I've had decent luck with that over the years.
The collectors went from 3" to 2-1/2". Since I'm running a full 3" exhaust I chucked them up in the lathes and went to work.
I took just enough off of the face of them to make them true.