I have an 05 Base without Monsoon and I use a box by USASpec that uses the CD changer controls to give me 2 sets of RCA inputs to use for AUX. I don't know if it would work with Monsoon or not. It works good, just have to turn up the volume. Once you get an AUX input, there's a couple devices you can plug it into to get Bluetooth. Belkin makes one.