I just bought a new Chevy. First thing I did was completely remove the onstar module. The in-dash compass stopped working, but that's easily replaced with a stand-alone GPS. Both terrestrial and satellite radio work. The blue-tooth is a bit wonky; but I'm hoping that, with some trial and error, I can reconnect the bluetooth antenna without reconnecting the cellular antenna. Even if I can't get the bluetooth working, that's a VERY small price to pay to know my car is secure from wireless hacking.