Default CD System + HD Radio??
 

I actually know nothing about HD Radio, but as I head the sound quality is so good, I wonder if I can have it in my Z.
after a little research online, I found more info here: http://www.hdradio.com/buyers-guide/converter
It said sys should be HD ready, i guess that's no way I can install the HD function to the existing sys, right?

I have 2010 version and it came with a 6 disks cd sys, with aux in at the front panel.

anyone knows more about it?