I'm no car audio expert so keep that in mind lol but I did however install this mod on my Yukon. As far as bleed over I know what you mean. When I switch over to XM preview you can still here XM audio until you plug in your ipod/phone/mp3 and then it takes over. Not sure how it works but it does lol . I've never had any issues with background noise while using my phone for music either. Hope this helps.