Radio/CD Player/XM/DVD NAV questions

[VTSTOMPER]

So I have the adventure series and it came with the 6 disc Bose Radio. I want to put in the DVD nav, but the dealer said they cannot sell me one for my hummer? They said some security thing....seems weird to me.

On another note...I want to add XM to my radio I have now, but I also have the DVD/LCD monitors, so I want to make sure that is not using my AUX port on the back of the head unit. ( I only think it does because of the headphone light comes on when I have the wireless headphones turned on.) If it is using the AUX port I might have a harder time to put the XM in, or I will have to use the FM modulator...do any of you use an FM mod, if so, how does it sound?


Thanks!
Josh