yes it will cause a problem with inspection, because all exhaust fumes need to be exited behind the furthest seat back in the vehicle, and most likely the muffler is right under the back seat of an explorer.
Straight up muffler replacement isnt expensive, you could go with a cheap glass pack, but they are loud and blatty, but very cheap, or you can go for a regular muffler, and that should run you between 20-50 bucks for a muffler, plus 10 dollars a weld. So it'll cost around 50 bucks all said and done.
As for JB weld, im sure it will work given proper cure times. but im not sure of the heat resistance of it. But then again they may have some high temp JB weld that i dont know about.
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