Studs front and rear in manifolds?

I didn't have the time to think about it, just to easy to remove them. Even more so since I had just screwed them in, they were easy to take out.

I guess if you did slot the header flange, it would be easy. Though installing the header with the studs was a pain to impossible. This is where I discovered the problem, in doing so. On the Duster I have now.