I've never been impressed with the Avics. Everyone that I've heard did sound all that good I much rather stick with a non nav system and just use my phone if I need NAV. I completely gutted everything Monsoon related and ran my own RCA back to the amps and still kept the GMOS harness hooked up just because. Mines doesn't and never has chimed anyways (I prefer not hearing any type of chime). I know I can go get a cheap harness now and wire it in and it should work but I see no benefit.