The exhaust on the truck developed a leak at weld near the muffler. I didn't have time to bring it in this week and will be using it over the weekend on a camping trip.
So, I bought some "muffler weld" paste then wrapped a beer can around it and secured it with two hose clamps. So far it seems to be working perfectly.
I am under no illusion this is a permanent solution, hopefully it lasts long enough to get the truck into the shop.
(Also, I was kind liking the extra rumble. But didn't want it to get any worse)