We didn’t try to save it. I used my Sawzall and cut just in front of the front flapper valve and just behind the rear one. The stock exhaust went in the dumpster with just 400 miles on the truck.
I just finished helping my neighbor install the ATAK on his 2019 Silverado. We took our time and were done in just 1hr 15 minutes using a 2 post lift. Fit was great and sounds healthy on his 6.2 without being obnoxious. Nice!