Funny you should post your request
I happen to have what your're looking for, it's a more elegant solution than what you posted, it won't cost you a whole lot, and you won't have to change your radio at all!
Check out the post I made earlier: http://www.maxbimmer.com/forums/showthread.php?t=153050
If you're intrigued, let's talk. I really love this system, but can't use it in my E60.
2007 530xi, Black Metallic Sapphire, 6 speed manual, Sport package, Cold Weather Package, Premium Package, Premium Sound Package, Sirius Satellite Radio
Last edited by JayArras; 09-15-2012 at 10:40 PM.