Hi All,

Audi A3, 2005 TDI 2.0 Diesel, i would like to upgrade my Audi concert to either Concert ii+ or Symphony ii+, i would like to know which would be easier to install and also would i need to also change the heater and the amber and tray units? I have the Bose sound. Instructions on doing this would highly be appreciated

Also if anyone could shed some light, what are the difference between the Concert ii+ and Symphony ii+

A picture of what is currently in my car is attached. thank you lads.