Let me see if I can simplify this a bit for you guys. First of all, The picture in the link with the quad tips is not the correct picture but I will get to that later.
The GMPE system IS the Borla Touring System. It is built at Borla and DEALER installed. If you order the package when you order the truck it is still a dealer installed item.
The GM "branded" version is only available with the bent tailpipes for the factory bumper tips.
The Borla "aftermarket" systems are available with the bend for the factory tips or straight tailpipes that will accommodate different tips. Borla offers three choices of their tips.
A Borla Touring system with quad tips will be EXACTLY the same as the GMPE system except it wont have the tiny bend at the end of the tailpipe so you can slide tips on it. All of the other piping, joints, muffler and pipe size are identical.
Again, speaking about 2019+ 6.2L Borla Touring and GMPE systems.
The Sport and ATAK systems are also exactly the same except for muffler/resonator and are available in the same configurations.
-Eli