I had a 17 i just traded in on a 2020. I took the headers x-pipe and mufflers i had put on the 17 off before it went to the dealer with plans i'd reinstall on the 20. I didnt realize the 20 came with the quad tips. I much prefer the look of the 20 exhaust so I am debating on what to do. Right now i might do the headers and x-pipe and leave the factory mufflers in place.
Not sure what mufflers you had on your 17 but the Roush ones I have are slip on tips so I could just buy quad tips and rock on with the same mufflers on an 18+. Might be something to look in to. I'm sure a good muffler shop could cut and weld quads on if yours don't slip off.