Well, I thank you for your assistance. I didn't drop the Y down, but I did take off the bottom of the heat shield at that connection for better access. Building up the flange took much patience but eventually it was a consistency of clay and I was able to shape it as I wanted. The Permatex Ultra Copper is messy stuff, but it worked. I got everything repaired, back on, tightened down, and his car is nice and quiet again. On to the next repairs for him: Why does he have water in one of his back lights, why is the license plate bulb not working, and fix the utility port. Some day I'll get to my car. lol