Switch to AUX? STAY IN AUX! You have a 2820 now, so you have XM and MP3's right at your fingertips! I've had my 2730/2820 mounted for 3+ years and AUX is the only mode I'm EVER in! ENJOY!!!I have to admit though that I'm not happy with the fact that I have to switch to AUX mode in the headsets to receive a call or use the phone!