I also had an exhaust leaking. I took it into my dealer for some warranty issues, leaking water pump, injector light (replace speed sensor), and asked them to look at a few other issues I had. They found the muffler to be out of line and the adjusted the header pipe. Now, with everything aligned and in place our 2019, Z8 is so much more quiet. From talking to the service manager this header/exhaust/muffler mis-alignment is a real problem and one they've had to fix a lot. Good thing, they knew just what to do.