Hello,

I am working on an exhaust manifold and i am facing some difficulties creating boundary feature. As you can see from the picture, I am cutting the runners and the turbo flange and want to connect them using boundary feature, so the model has better shape. No matter how deep I cut the runners, every time I get the strange creation circled in red on the second picture. Can someone help me with this and explain why this is happening and how to fix it, please?