ok so ive read and read and read but havent found a solid answer. I have a 99.5 a4 facelift model with a single din radio and am trying to find out what is needed and what has to be done to convert to double din to install either an avic d3 or avic f90bt and what kind of dash kit will be needed. Also if anyone has any info they can give me to help me decide which radio is better that would be awesome.