inputs.text: worth far cost - 1986 bmw 635csi sports coupe original alpine amfmcassette head unit finally failed welcomed reason upgrade user interface cars factory audio system alpine offers sophisticated units cde134hd provided current technology felt car really needed hd radio tuner cd player miniplug stereo auxiliary smartphone input usb port cde134hd easy install within hour everything working expectations sonically original alpine speaker system alpine amplifier integrated beautifully new cde134hd makes existing components perform better hearing music detail previously missing upgrade cde134hd even better choice given price paid amazon recommended