Own a e36 that I just bought and wanted to know how to fix a couple of recent problems I have run into, and upgrade the machine. Year of car is '92 325is. The computer reads that I have a brake light fail, what should I think of this b/c it is wrong, I have no brake fail. Another issue I have is I am interested in upgrading the factory system I have by simply increasing the power. I want to buy an amp and if needed replace the speakers. Which Amp b/c I have an 8 speaker system? Do I need to replace all 8, can I get better sound from just 6? What about my head unit, staying factory would be nice and adding an fm cd changer, or should I spend the money and but a cd head unit? Which one would look good and is below 300 US dollars.