Mine cracked right behind the cat - my wife was on the road and had a local shop weld it temporarily. Later I fashioned a brace with a band about 3 inches wide of some thin but strong steel. I sealed it up with the permatex or similar then before the permatex set I wrapped the band around and secured it in place with 2 high-quality old-fashioned muffler clamps.

I didn't want to replace a system that otherwise had no sign whatever of damage.

I since drove from Chicago to northern New England, and also to the Rocky Mts without incident. I'm sure it will crack in some other place, but not necessarily soon.

By the way when the crack was present and the exhaust was audibly leaking I got a code for rear oxygen sensor out of range, which went away by itself after the repair.