I already bought one and when I took it to get it installed they told me I had purchased the wrong aux kit (I bought this one http://www.ebay.com/itm/BMW-E39-525i...H1xYNQ&vxp=mtr), my radio apparently doesn't have a connector for this on the back. Can anyone point me in the right direction on which one is correct, I have a 2006 X5 w/ Navigation and cassette.

Also, does anyone have experience with there AC making noise while braking? It only happens when the AC in on low (less that 5 bars).

Cheers, Nicholas