I have been doing some research on new cat converters to replace mine that I thought was bad until today. I was poking around and found a crack in a weld along the bottom of the cat that I'm almost 100% sure is the cause of the rattle. Since this isn't internal and is just a broken weld can I fix the crack instead of buying a new cat? Also, if I can weld this, is there any alternative to welding? Like an apoxy or some sort of clamp?