With OBD11 I turned the soundaktor off so I can hear the actual engine and exhaust not fake sound, turned DRLs off and added a toggle for them in the infotainment screen settings, turned seatbelt warning off, turned mode illumination off (so passengers don’t know if I’m in
Cupra mode
), set fans to display speed when on auto, and set mirrors to fold in with first lock button press instead of having to hold down the lock button. There are other things like needle sweep, increased engine responsiveness, reverse light brightness etc. And you can code too. Also depends what features your car has e.g. lane assist, traffic sign recognition.