You’re in the 8L section here (1996-2003) but sounds like you’re talking about 8V (2013-2020).
I have a facelift late 2016 (UK 66 Reg) and that is pre GPF.
Basically, the “sweet spot” is cars that are facelift, registered between 2016-2017 (66/17/67 plates). The S3 in this period has 310ps instead, and sounds pretty decent on a standard exhaust system.