Exhaust manifold gasket leaky

[Punchy]

Interesting thing I see on this busted gasket between the turbo and the pipe section with the DPF doser and NOx sensor. I didn't notice until a passersby pointed it out. The broken part that looks like a donut with a bite in it. There is actually a guide hole that lines up with the pipe section. (Red arrow) A small bump is there in the pipe that'll go through the gaskets hole. I didn't see that because the "donut bite" is there widening the guide hole. You see the new bump I made when I removed the pipe previously and reinstalled (Yellow arrow).