2010 Sentra catalytic converter
 

On a 2010 Sentra... the front flange on center muffler disintegrated... and the catalytic converter is loose and hanging down... I tried to free up the nuts on bolts at front of cat but they are so froze and bolt turns ... so... is it okay that cat is loose like that because of the springs and will new muffler force the cat to snug up enough or must I somehow get the cat tighter ? Thanks!
https://cimg9.ibsrv.net/gimg/nissanf...6e7717c80c.jpg
https://cimg3.ibsrv.net/gimg/nissanf...5bb959c002.jpg