I own A3 1.8 1998 and I just installed 1.8T engine (AUQ, 180PS) to my car and change all wiring system. The centre console is also changed to facelift version. However, the radio is missing and I need to replace.

Is it possible to install Audi concert II? Are there any requirements at all? What are the differences between previous radio and Audi concert II. This may sound stupid but I need all your helps.