Several weeks back, I posted a topic requesting peoples' opinions on the Mazda 6. Based on your opinions, (one of which was relevant to my question) I went ahead and bought a leftover, fully loaded 2004 Mazda 6. I was wondering though... the 6 has an MP3 option. Does anyone know what type of media this MP3 option uses. I assumed the option came with my 6 disc Bose system, but it did not.

Any help is appreciated!