i understand he wants nothing to do with XM. but even if he wanted it, its not in his stock HU. if it was there it would have a xm button on it. no way XM is putting dormant receivers in radios for sh!ts and giggles. they cost money after all.
what i think hes saying is he thinks he can re wire the HU to have a ext 6 disk changer so he can use a aux port maybe. and thats not gonna be easy to do.