This is the pipe between the cat and the header pipe, which has the flex section. Anyone know if there are studs or thru-bolts that hold the flanges? The cat side connections looks like studs which are threaded into the cat side flange and would have to be drilled or torched out. The head pipe side looks like thru bolts. I usually use a cutoff wheel on the thru bolts, remove them and replace with them new bolts. This won't work as easily on studs. Can anyone confirm? Any input on experience with a part brand fit and quality?