I have a 1990 Audi 100 it was my parents but recently my dad got a new car and gave it to me. Now the car is totally stock and I wanted to do some audio stuff. I was going to put some somy xplod speakers and cd headunit in, but I've heard there are some issues with the alarm not honking after locking the car with an aftermarket head unit. So could someone give me some more info, and if there is a fix to this then how step by step. Also if anyone has any pictures of a cd player in the Audi 100, can you please post it I just want to see how it looks. Any info will be appreciated. Thank you....