I have no idea what your talking about but as you mentioned Ipod into a BMW i will tell you you about my ipod in my e-46.
First thing is, if you want to put an ipod into a BMW forget the FM transmitters, they are crap, i have found the best way to to intergrate the ipod fully is to get an ice link plus kit made by dension visit there website www.dension.com
or your local BMW dealer.
This kit replaces your multi changer completely, once installed you can control the ipod by your strereo and multi function steering wheel and the sound quality is superb, i find it better quality that the standard BMW multi changer and it charges the ipod while you are moving, meaning you dont have any nasty looking cables on show and you can still use the cigerette lighter.
I have my I pod connected to my BMW SAT/NAV professional system with TV tuner, With Alpine 5 channel amp running infinity referance front doors and rear shelf with a 12" sub in the boot. the sound is crisp,clean and punchy the way it should be. The ice link kit only took me 20 mins to install and there are no wires showing, and i'm no professional installer. I hope this helps.