Op, can you take a picture of the rear pipes entering and exiting the muffler. On the 2017 one single pipe in and four pipes exit the muffler. The welded in y-pipe seems likes something that was possibly customized for the CS.
The comp has 4 pipes into muffler and four pipes out. Seems to have the same y-pipes or muffler as CS. 2:47
It looks different to me. 19:49, but could be the angles.