I don't know what you're referring to exactly...but there are no coupling nuts.
I tried. It won't come out without dropping the exhaust. It'll get dealt with eventually, when I either have the exhaust apart for some reason, or when I get extra motivation to cut the thing apart. (which is much less likely than the first option)
The tube inserts for your front lower links look like giant female hex sections. I dunno.
For the cross member, I wonder how mine came out. I think I may have removed the section on the driver side that has flanges between the cat and muffler? I don't remember but I do remember thinking it was heavier than I expected. I had to cut a bolt off on the driver side for some reason too.
