Can someone tell me the difference between the Ipod adapter kit listed on circlebmw for $120.00 (part # 65 110 392133) and the Auxilliary Audio input (part # 82110149389) for $40.00 shown in the BMW accessory catalog. I have searched and found post about the adapter kit and a pdf file with installation instructions, but have seen nothing about the auxilliary audio kit. Which one to use? Do they both do the same? I don not have nav, sirus or a cd changer. Thanks for any info.