radiant exhausts? yeah they do a rough job, the last time i was there they were fixing my car, i was watching them like a hawk, i asked the guy who fixed it "so how do i know if its not leaking again or not?" he goes "just block the exhaust and look for it" i replied looking right into his eyes, "ok we'll do that then, if there are still leaks, i'm coming back here and ur going to do the whole thing again... see ya later mate" LAWL. lucky for them they did it properly. welds arent the best but at least the hole isnt there anymore. doesnt have to be a very clean weld on the outside but as long as it doesnt protrude inside blocking flow ur right. how did i know? i stuck a plumbers camera inside the exhaust to take a look at the whole piping. ;)