I don't see how that would help my header from cracking the way it does except for the weld around the base of the turbo flange.
But the cracking around the weld at the collector is another issue.
the crack in that pic I see is from weld technique and HAZ of the weld as well as the major cause that the FLANGE is holding all the weight of the turbo ... take the weight off the flange supporting the turbo.. Cracking weld at the flange is what is causing the other issue ... to do that right you would have to cut off that entire section and redesign that header for your application.
you will keep patching that and NEVER fix it otherwise.
A custom header would solve the issues.. but that header would be designed for your application ( which isn't really what the header your using is designed to do). If this is a sand rail you would have plenty of room for header design and customize it to prevent the issues.