6.0 uppipe question

[TurboV]

I'm playing around the idea of making my own t4 setup. I have sourced all parts but where to get the flare for the connection to exhaust manifold. I can source 304ss from a local company, but trying to find someone local to make the flare to the 6.0 stock exhaust manifold seems to be the trouble. Who does everyone use? Some local farmers want me to make some turbo kits, so i figured while its winter i would give it a try.