My wrench bender appreciated the quality of them and that they fit up perfectly and were easy to install. He's had Dormans and other Chinese knock-offs that needed massaging in the past and didn't have the dimple for the dipstick tube (I believe it is) that he had to add in himself with a ball peen hammer to get the clearance. Not so with the Internationals.
Been over four years with my International up-pipes. No problems at all. A lot of towing miles in hot summer months. However, if I were to do it again, I think I would have paid extra to have them ceramic coated. Might have helped with the heat a little.