Ok i'm about 1800 miles from my g/f's car('07 Grand Prix GT, 3.8 S/C) but i want to get her a ipod adapter for her car but need to know compatability with her radio. She has the 6 disk in dash, non-premium sound, and no XM installed but that's not to say the H/U isn't compatible for XM. Without pulling the H/U is there a way to know if the radio has the blank plug in the back for XM? Only things her car doesn't have is HUD, Monsoon, Onstar/XM