[AZKen]

I am not sure. In my original post, if you look at my lower left pic, at the top truck, you can see the tail pipe that seems to match the pic you zoomed up and marked. This would be slightly different than Funky61. I believe that the factory did it the way you have marked in order to clear any bumper for Wide side or Flare side that was ordered or upfitted. Funky's pipe does look pretty original. The GMC brochure pics are the best source, but hard to tell exact routing at the end.