Welcome - nice to see another shadow blue GTI. I picked up mine about 2 years ago at about the same mileage that you have but only put on around 4000 miles since then as it’s my 3rd car and only play with it now and again. I have done similar with regard to maintenance work.
I upgraded my head unit to RCD330 which cost me about £120 and works great with iPhone for car play. I did upgrade the canbus just in case but I was made aware that there is a connector solution which supposedly fixes battery drain but I haven’t installed so I don’t know if that is the case or not. Something like this:
https://a.aliexpress.com/_dTK37eKI bought complete brand new front and rear R32 brake kit which I have yet to install as I was waiting on my current disc/pads to wear to them change them. I did upgrade/lower my car with H&R springs and Bilstein B8 dampers as one of my rear spring snapped so it needed doing anyway. For me this is a nice sporty/comfortable set-up. I have already acquired secondhand Passat lower control arms and Superpro Anti-lift kit so I need to install that also which I will look to do at same time as my brakes.
Anyway this is mine
Sent from my iPhone using Tapatalk