Nice, welcome to the forum ;-) I've had my 2019 about 3 months now. I've been looking at exhaust as well. FYI the 18-19 have a different rear valance, so exhaust that are made for the 15-17 won't work or will have to be modified to fit correctly. I installed a res-delete pipe as a temp/quick fix, it's a cheap way to get a little more volume (no drone) and less restriction. Honestly, it's just a small bump in sound, most people won't notice it, especially inside the car, but it is a little more outside the car.
I've been looking at the APR (valveless) and AWE track edition, but haven't pulled the trigger yet.
Have fun modding ;-)
I told myself when I got the car, that I wasn't going to mod it, LOL, but in 3 months I've already changed the wheels, springs, res-delete, short shifter, badge skins and a JB4. Oh well.
Some pics here:
https://www.golfmk7.com/forums/showthread.php?t=54484
Good luck with your new car!!