Well I got rear ended and the car was totalled five months after I got it The empeg is now installed in my 04 mini.

As far as the mazda goes I did have the empeg in there with another head unit. I just connected the two head units together and stuck them in the hole where the factory unit was. It was pretty ugly with no face plate though.

I went to one install place and they wanted about 500 to make a face plate adaptor.