Re: Leaking Exhaust on YJ
This was something I learned from a leaky pipe above the cat. converter.
The meshed chemical structure got melted inside the cat. so gas didn't go freely to the muffler.
It escaped from the pipe seams prior entering the cat. and creating back pressure to the engine (lost of power).
Check the cat. closely.
Yes, it got pretty hot in there.
Also use as few pipe couplings as possible.
I welded my seams all around (but that's CJ)