I have a 2006 X5 4.4i with DSP and 6 cd changer Nav radio.

Is that HD Radio? If not, how can i get HD radio with a better sound quality.
I just rode in my buddies 2008 325xi and the basic radio sounds so much amazing in his car.

thanks for any input,

__________________
_____________________________________________
Present Toy:
2008 BMW X5 3.0si
(Sport Package, Technology Package, Space Gray with Black Nevada Leather)
_____________________________________________