I have the single disc AM/FM. I understand that for 2006 there's the option to have a cd that plays MP3, and has an auxiliary input.
I'm sure it would cost an outrageous amount, but if I wanted, would Toyota do it for me?
They shouldn't have to be. 2 DIN is understandable for a 6 CD changer with tape deck. Even a 6CD integrated changer as 2DIN makes sense, but radios have accomplished it in 1 DIN, especially with the amp circuit offloaded to another location.