Start by getting the active autowerke downpipe.
It significantly increases the sound without making it obnoxious, which is very important, especially if you have never modded a car before.
if you want more, you can get an exhaust, but its best to do 1 step at a time
I'm not a fan of the muffler delete; it makes the car loud, but not in a good way. lots of unwanted noise in my opinion.
pairing it with your catless downpipe is the worst exhaust decision you can make in my opinion