I finally cleared out space in the garage to pull the truck in and have a look at the exhaust on it.
It looks like someone tried to make a head pipe for it. If I had to guess I'd say the weld near the flange has a lot to do with the leak.
On the other side it looks like they were able to reuse the top of the pipe where it's flanged so this side doesn't leak.
Nice welds.
Thankfully the pipe is still available, Walker 40235, 58.79 from Rockauto. Also thankful Dodge used bolts and not studs at the flange.
Personally though, I like the muffler
Saving money on clamps