Some newer cars integrate all kinds of stupid things into the fac head units now days. Part of hte ECU functions, security, etc etc and cause problems when the head unit is pulled.
CAn I just swap out the head unit on the WRX (Saabaru 92 actually.) without having to worry about anything like this? I've got one waiting to go, and hopefully I'll take delivery of the Saabaru in a day or two.