I pulled the OEM CD changer and head unit from my Mk 4.
Replaced it with a Pioneer unit with DAB, Bluetooth, phone connectivity etc. I like the functions, but the buttons etc are fiddly, display too small for me to see (nearly been in the hedge a few times because of this). Volume pot is too sensitive for the pot holed excuses for roads round here, plus the fact that its multi function means you go to turn it up / down, pot hole - press it by mistake and enter a menu system, squint at it to see what the hell is going on, hedge etc.
Any ideas on something a bit more OEM clunky plastic, volume knob that just goes up and down, simple clean display but with the functionality of new units - phone integration, bluetooth, and DAB? Don't need sat nav.
I run amps in the boot and upgraded front and rear speakers. Occasionally pop a sub in the boot and pretend its the 90s.
Cheers - Chris.