Soft or hard bolts for exhaust flange?

I tell you what breaks exhaust bolts and studs off worse than anything I ever saw. New cars. From like 1990 on up. I think they were made to be put on one direction one time. When I worked for Toyota, we dreaded doin anything requiring removing the head pipes from the manifolds cause they always broke. You can even see how the nuts are serrated on the ends to grab the stud when you try to loosen it. GHEY.