Thinking about exhaust options

[bcar00]

Ok, I will. ha ha. Welding thin metal isn't that easy IMO. As @bcar00 said. Good thing is it can leak a little and NBD. its not a gas tank. I'd get some metal the thickness of the cat box and see how you do. Then there's the type of metal. not sure what the cat is made of

Good points. I think it's a low grade stainless. Welded well with both stainless rod (308 TIG) and normal carbon steel.